The partitioning of diblock (AB) and triblock copolymers (ABA and BAB) into a slit pore with the B block set at the critical condition were investigated with lattice Monte Carlo simulations and were compared with the partitioning of a homopolymer (A) with the same length of the A block. The study aims to understand the effect of block ...

Diblock copolymers (AB) blended with homopolymers (A) may self-assemble into lamellar, cylindrical and spherical micelles. The critical micelle concentrations for different micelle shape are determined using self-consistent field theory. The effect of varying copolymer block asymmetry, homopolymer molecular weight ...

We use self-consitent field methods and analytical theory to deterime the behaviour of AB copolymers at the interface between two incompatible homopolymers, A and B. We calculate the reduction in interfacial tension, {gamma}, resulting from the copolymers localizing the A/B interface. We examine the effects of ...

... Properties of Some Diblock Copolymers Based on 1,3 Butadiene Monomer. ... polymers is comprised of two diblock copolymers of polystyrene and 1 ...

Balanced A-C diblock copolymer surfactants were designed to organize mixtures of immiscible A and B homopolymers. The balance of attractive and repulsive interactions can lead to the formation of ordered and disordered structures using smaller amounts of diblock copolymer than in conventional A/B/A-B mixtures ...

We investigate the properties of a planer interface separating a lamellar structure and a gyroid structure in AB-type diblock copolymers. Depending on the relative orientation between lamellar and interface planes, we find that there are three different structures of an interface. Motion of an interface invading the unstable state is ...

A-B diblock copolymers of polystyrene-block-poly(methyl methacrylate) were prepared by anionic polymerization and labeled with one naphthaleneeither at the polystyrene block end or at the polystyrene/methyl methacrylate block boundary. B-A-B triblock copo...

... Accession Number : ADD424591. Title : Viscoelastic Properties of Homopolymers and Diblock Copolymers of Polybutadiene and Polyisoprene,. ...

A binary solution mixture of distinct block copolymer micelles is found to adopt a superlattice. The larger micelles, formed from polystyrene-polyisoprene diblocks, have a nominal radius of 29 nm; the smaller micelles, formed from polystyrene-polydimethylsiloxane diblocks, have a nominal radius of 16 nm. The superlattice unit cell ...

... Accession Number : ADA206504. Title : Path Dependent Morphologies of a Diblock Copolymer of Polystyrene/ Hydrogenated Polybutadiene. ...

The self-assembly behavior of AB/AC amphiphilic diblock copolymer mixtures in dilute solution was studied by a real-space-implemented self-consistent field theory in three dimensions. The AB and AC copolymers have a common hydrophobic block A but different hydrophilic blocks B and C. Two cases ...

It is well known that lamellar structure, hexagonal structure of cylinder domains, gyroid and body-centred cubic structure of spherical domains all exist as equilibrium structures in AB-type diblock copolymers. We shall show in the present letter that, in addition to the above four phases, there is another equilibrium phase, the ...

It is well known that lamellar structure, hexagonal structure of cylinder domains, gyroid and body-centred cubic structure of spherical domains all exist as equilibrium structures in AB-type diblock copolymers. We shall show in the present letter that, in addition to the above four phases, there is another equilibrium phase, the ...

Using self-consistent field theory (SCFT), we examine dry brushes of AB diblock copolymer, where the B ends are uniformly grafted to a planar substrate. Four different morphologies are predicted, which are conveniently described as the uniform, stripe, hexagonal, and inverted hexagonal phases on the basis of the patterned formed at the ...

Self-assembly of AB diblock copolymer/C homopolymer blends with reversible supramolecular interactions was studied by real-space self-consistent field theory. The reversible bond is formed between the B free end of the AB diblock copolymers and one end of the C ...

The phase behavior of binary blends of a long symmetric AB diblock copolymer and a short asymmetric AB diblock copolymer is studied using the self-consistent mean-field theory. The investigation focuses on blends with different short diblocks by ...

A theoretical study for nanoparticle partitioning in the lamellae of diblock copolymers Jiezhu Jin of a singe nanoparticle in the lamellae of symmetric diblock copolymers.3 They found that nanoparticles of nanoparticles at low concentration within the lamellae of block copolymers. Departing ...

Using self-consistent field theory (SCFT), we investigate the morphologies formed by a melt brush of AB diblock copolymers grafted to a flat substrate by their B ends. In addition to a laterally uniform morphology, SCFT predicts three ordered morphologies exhibiting different periodic patterns at the air surface: a hexagonal array of ...

A numerical method in Fourier-space is developed to solve the polymeric self-consistent field equations. The method does not require a priori symmetric information. More significantly, periodic structure can be adjusted automatically during the iteration process. In this article, we apply our method to AB linear diblock copolymer melt, ...

Small angle neutron scattering was performed on disordered mixtures of nonadsorbing homopolymer (A) chains and diblock (A-B) copolymer micelles in an A selective solvent. Increasing the molecular weight or concentration of A led to an increase in the aggregation number, and a decrease in the effective hard-sphere diameter of the ...

We have performed continuum self-consistent field (SCF) calculations to study the solvent response of diblock copolymer A-B brushes, where all copolymer chains are grafted onto a flat and impenetrable substrate and immersed in a solvent. In order to avoid the numerical problem associated with the ?-function initial ...

Diblock copolymers with well defined block length yield ordered phase separation. Morphology of the microphase separation is controllable by varying the weight ratio of the two blocks and the length of each block. If one of the blocks is a side chain liqu...

The purpose of my poster is to study the driving forces behind the self-assembly of a diblock copolymer AB, consisting of a solventphilic block (B) and a solventphobic block (A), in selective solvents (S). Micellar transformations between spherical, cylindrical, and bilayer curvatures for a model system are tracked using ...

The synthesis of poly(methyl acrylate)-block-poly(gamma-benzyl-L-glutamate) (PMA-b-PBLG) diblock copolymers, using atom-transfer radical polymerization (ATRP) of methyl acrylate and living polymerization of gamma-benzyl-L-glutamate-N-carboxyanhydride (Glu-NCA) is described. Amido-amidate nickelacycle end groups were incorporated onto amino-terminated ...

... Title : Diblock Copolymers of Polystyrene/1,2 Polybutadiene and Polystyrene/ Polybutene-1: Molecular Structure, Morphology and Mechanical ...

Introducing molecular chirality into the segments of block copolymers can influence the nature of the resultant morphology. Such an effect was found for poly(styrene-b-L-lactide) (PS-b-PLLA) diblock copolymers where hexagonally packed PLLA helical microdomains (H* phase) form in a PS matrix. However, molecular ordering of PLLA within ...

The polydispersity effect of amphiphilic AB diblock copolymers on the self-assembled morphologies in solution has been investigated by the real-space implementation of self-consistent field theory (SCFT) in two dimensions (2D). The polydispersity is artificially obtained by mixing binary diblock ...

We employ the dynamic extension of self-consistent field theory (DSCFT) to study dynamics and order�disorder transitions (ODT) in AB diblock copolymer binary mixtures of two different monodisperse chain lengths by imitating the dynamic storage modulus G? corresponding to any given morphology in the oscillatory shear measurements. The ...

We study the effect of adding salts on the lamellar phase of AB diblock copolymers by means of the self-consistent field theory. We consider a model in which the A and B blocks have different dielectric constants. We include the Born energy to account for the preference of salt ions to be solvated by higher dielectric polymer. We first ...

... copolymer systems, the stabilization of binary polymer blends by diblock copolymers, and the range of validity for mean field theories of polymer ...

Random and diblock copolymers of 2-(N,N-dimethylamino)ethyl methacrylate and butyl methacrylate are prepared by ATRP. As mimics of cationic antimicrobial peptides, the random and diblock copolymers show similar antimicrobial activities. In contrast, the diblock copolymers ...

... Title : Homogeneous and Heterogeneous Blends of Polybutadiene, Polyisoprene and Corresponding Diblock Copolymers. ...

... 3 Compatibilization of Blends of Crystallizable Polybutadiene Isomers by Precipitation and by Addition of Amorphous Diblock Copolymer by ...

The compression coefficient and the mean curvature coefficient of a composite of an A-B diblock copolymer charged with nanoparticles depend on the concentration of nanoparticles and on the dissymmetry of the copolymer chains. Concerning the curvature coefficient, a distinction must be done between an adiabatic and ...

The self-consistent field theory (SCFT) complemented with the Poisson-Boltzmann equation is employed to explore self-assembly of polyelectrolyte copolymers composed of charged blocks A and neutral blocks B. We have extended SCFT to dissociating triblock copolymers and demonstrated our approach on three characteristic examples: (1) ...

The self-consistent field theory (SCFT) complemented with the Poisson-Boltzmann equation is employed to explore self-assembly of polyelectrolyte copolymers composed of charged blocks A and neutral blocks B. We have extended SCFT to dissociating triblock copolymers and demonstrated our approach on three characteristic examples: (1) ...

By a combination of theory and experiment, we investigate the factors that control self-assembly of ABC triblock and ABCA tetrablock copolymers. The focus of this study is to understand the effect of attaching or inserting a third block (block C) into AB diblock and ABA triblock copolymers. Theoretical predictions ...

The effect of polydispersity on an AB diblock copolymer melt is investigated using lattice-based Monte Carlo simulations. We consider melts of symmetric composition, where the B blocks are monodisperse and the A blocks are polydisperse with a Schultz-Zimm distribution. In agreement with experiment and self-consistent field theory ...

The effect of addition of A homopolymer chains to HEX phases formed by cylindrical micelles obtained by dissolving an AB diblock copolymers in an A selective solvent was investigated. The following general trends were observed: (i) order-order transitions from HEX???Gyroid (G)???Lamellae (LAM); (ii) the inter-cylinder spacing of the ...

We previously reported the discovery of a novel bicontinuous microdomain structure with Fddd symmetry in polystyrene-block-polyisoprene (SI) diblock copolymer. Then we confirmed the stability of Fddd structure and found Fddd structure exists as an equilibrium structure in SI diblock copolymer. Also we determined ...

... Study of Phase Behaviors in Diblock Copolymers in Selective Solvents. ... MD Self-consistent Theory of Block Copolymer Blends: Selective Solvent. ...

We perform a theoretically informed coarse grain Monte-Carlo simulation in the nPT-ensemble and the Gibbs ensemble on symmetric ternary mixtures of AB-diblock copolymers with the corresponding homopolymers. We study the lamellar period by varying the length and amount of homopolymers. The homopolymer distribution within the lamellar morphology is ...

Pereira [Phys. Rev. E 63, 061809 (2001)] has recently predicted that the hexagonal symmetry of the cylindrical phase in AB diblock copolymer melts is highly unstable. This is in stark disagreement with experiment, and can be attributed to the fact that the connectivity of the A and B blocks is not enforced in his implementation of the ...

Pereira [Phys. Rev. E 63, 061809 (2001)] has recently predicted that the hexagonal symmetry of the cylindrical phase in AB diblock copolymer melts is highly unstable. This is in stark disagreement with experiment, and can be attributed to the fact that the connectivity of the A and B blocks is not enforced in his implementation of the ...

... prepared by catalytic hydrogenation of precursor amorphous diblocks of (l,4polybutadiene)-b-(1,2polybutadiene), poly(4B2B ...

We report for the first time multiple vesicular morphologies in block copolymer complexes formed in aqueous media via hydrogen bonding interactions. A model AB/AC diblock copolymer system consisting of polystyrene-block-poly(acrylic acid) (PS-b-PAA) and polystyrene-block-poly(ethylene oxide) (PS-b-PEO) was examined ...

Polymeric bicontinuous microemulsions are thermodynamically stable structures typically formed by ternary blends of immiscible A and B homopolymers and a macromolecular surfactant such as an AB diblock copolymer. Investigations of these bicontinuous morphologies have largely focused on model systems in which all components have narrow ...

Polymeric bicontinuous microemulsions are thermodynamically stable structures typically formed by ternary blends of immiscible A and B homopolymers and a macromolecular surfactant such as an AB diblock copolymer. Investigations of these bicontinuous morphologies have largely focused on model systems in which all components have narrow ...

Polymeric bicontinuous microemulsions are thermodynamically stable structures typically formed by ternary blends of immiscible A and B homopolymers and a macromolecular surfactant such as an AB diblock copolymer. Investigations of these bicontinuous morphologies have largely focused on model systems in which all components have narrow ...

Using computer simulation of a coarse-grained model for supramolecular polymers we investigate the potential of quasi-block copolymers (QBCP) assembled on chemically patterned substrates for creating device-oriented nanostructures. QBCP are comprised of AB diblock copolymers and supramolecular B segments that can ...

The effect of the number of arms on the grain growth kinetics of a series of lamellae-forming AnBn star block copolymers has been investigated via transmission electron microscopy (TEM) image analysis. Across this series all materials have the same A and B block molecular weight and all have the equal number (n) of each type of arm. As n increases from 1 ...

Two diblock copolymers of polydimethylsiloxane and nylon 6 have been synthesized using a macromonomer approach. PDMS was synthesized anionically in THF and terminated with 11-(dimethylchlorosilyl)-N-undecanoyl-1-caprolactam, yielding a macromonomer capabl...

The goal of this project was to use molecular simulation to quantify the impact of additives on the onset and structure of bicontinuous phases in linear diblock copolymers (DBC). The focus was on understanding how additives with selective affinity for a g...

We present a dissipative particle dynamics simulation study on the formation of nanostructures of symmetric diblock copolymers confined between planar surfaces with and without nanopatterns. The nanopatterned surface is mimicked by alternating portions of...

Through the use of a selective solvent a reversible surface reconstruction of diblock copolymer thin films was observed. The solvent selectivity and solubility of the minor component block were found to be crucial to generate nanoporous films with pores t...

The physical properties of polyacetylene diblock copolymers containing polystyrene (PS) or polyisoprene (PI) blocks of various compositions are studied using electron spin resonance, resonance Raman scattering, and room temperature conductivity measuremen...

We have developed a technique to create polymer thin films with a controlled, continuous gradient in film thickness. As a demonstration of the utility of this technique, we have revisited the well-studied phenomena of the morphology of symmetric diblock copolymer thin films.

The miscibility of homogeneous diblock copolymers of 1-4-polybutadiene and cis-1-4 polyisoprene with either or both of the corresponding linear homopolymers was found to depend upon the relative lengths of the block segments and upon the coordinates of th...

The surface properties of symmetric microphase separated diblock copolymers of polystyrene (PS) and polymethylmethacrylate (PMMA) were investigated using X-ray photoelectron spectroscopy (XPS), the specular reflectivity of neutrons and secondary ion mass ...

Intensive research on block copolymers for their unique phase behavior and natural application as surfactants has gone on for a number of years now. The introduction of these materials into selective solvents has expanded the range of their application to diverse areas, from biological scaffolds and drug delivery to ceramics processing and nanocomposites. This dissertation ...

Motivated by recent experiments of copolymer patterning by nanoimprinting, we investigate microphase separation and morphology for symmetric AB diblock copolymers with lamellar structure in bulk, confined between a flat bottom surface and a square-wave top surface by using the self-consistent field theory (SCFT). ...

... We began with a diblock copolymer of styrene and lactic acid. We chose a concentration of lactic acid which would give ...

... In addition, we present some information on certain hydrogenation and deuteration reactions on homopolymers t: -'u~port the assertion that the ...

... 4132047 02) 11~. TITLE_ (include Security Classification) Evaluation of Domain Spacing Scaling Laws for Semicrystalline Diblock Copolymers ...

... Accession Number : ADA231958. Title : Evaluation of Domain Spacing Scaling Laws for Semicrystalline Diblock Copolymers. ...

The effect of the median selective solution on the lamellar, spherical and gyroid structures is studied. The self-consistent field equations of the diblock copolymer solution are solved by using the reciprocal space method. It is shown that the spherical and gyroid phases have the lowest free energy in the certain range of the solution concentration. ...

of shear alignment would be straight- forward. While this type of in situ microscopy is not currentlyShear-Induced Lamellar Rotation Observed in a Diblock Copolymer by in Situ Small-Angle X the dynamic process of shear alignment in a lamellar poly(styrene-b-ethylene propylene) diblock copolymer

Oligo(phenylenevinylene) -poly(ethyleneglycol) (OPV-PEG) diblock copolymers in tetrahydrofuran (THF) solution at concentrations of 5 to 25 gl self-assemble into rod-like structures with a radius of about 80 (angstrom) for an OPV-PEG diblock copolymer comp...

Of concern in the present report is the diffusion of homopolmer chains into microphase separated symmetric diblock copolymer hosts. Forward recoil spectrometry was used to study the diffusion of deuterated PS (d-PS) and of d-PMMA into two symmetric diblock copolymer hosts comprised of polystyrene (PS) and ...

... Our recent discovery of the double gyroid (DG) micro-domain structure in a poly styrene-poly isoprene di-block copolymer (Macromolecules 27 ...

In these studies, amphiphilic AB diblock and ABA triblock copolymers containing poly(lysine) (P(Lys)) were synthesized and their solution assembly studied using dynamic light scattering, circular dichroism spectroscopy and transmission electron microscopy. Rod-coil block copolymers containing P(Lys) are able to ...

During the first year of this proposal significant strides have been made in understanding the nature of the interface in symmetric, diblock copolymers and the nature of the interface formed between immiscible homopolymers. Emphasis has been placed on the symmetric, diblock copolymers of polystyrene (PS) and ...

During the first year of this proposal significant strides have been made in understanding the nature of the interface in symmetric, diblock copolymers and the nature of the interface formed between immiscible homopolymers. Emphasis has been placed on the symmetric, diblock copolymers of polystyrene (PS) and ...

Dissipative particle dynamics (DPD) simulations have been employed to study the microphase separation of the poly(styrene-b-isoprene) (PS-b-PI) diblock copolymer. The DPD model is constructed to match the physical description and structural properties of the PS-b-PI diblock copolymer. A coarse-grained force field ...

We have demonstrated micropatterning of a single layer of nanoparticles by combining a self-assembly of diblock copolymer micelles with conventional and soft lithographical methods. On a photoresist micropattern fabricated by conventional photolithography, a single layer of diblock copolymer micelles containing ...

The self-assembly of symmetric coil-rod-coil ABA-type triblock copolymer melts is studied by applying self-consistent field lattice techniques in a three-dimensional space. The self-assembled ordered structures differ significantly with the variation of the volume fraction of the rod component, which include lamellar, wave lamellar, gyroid, perforated lamellar, cylindrical, ...

The self-assembly of symmetric coil-rod-coil ABA-type triblock copolymer melts is studied by applying self-consistent field lattice techniques in a three-dimensional space. The self-assembled ordered structures differ significantly with the variation of the volume fraction of the rod component, which include lamellar, wave lamellar, gyroid, perforated lamellar, cylindrical, ...

Herein we report the synthesis and solution characterization of a novel series of AB diblock copolymers with neutral, water-soluble A blocks comprised of N,N-dimethylacrylamide (DMA) and pH-responsive B blocks of N,N-dimethylvinylbenzylamine (DMVBA). To our knowledge, this represents the first example of an acrylamido-styrenic block ...

Nanostructured Block Copolymer Dry Electrolyte Ayan Ghosha, * and Peter Kofinasb,z a Department electrolyte with enhanced lithium transport based on a self-assembled diblock copolymer. The diblock copolymer electrolyte. Impedance and temperature studies were carried out to characterize the ...

Polymers, elastomers, and plastics PACS.82.70.Dd Colloids Abstract. Diblock copolymer polystyrene-polyisoprene for polyisoprene and a theta solvent for polystyrene at Te = 70 �C. The molecular mass of the copolymer is I-I x 10 of copolymer chains in the micelle have to be taken into consideration. For example, ...

A convenient two-step protocol is presented for synthesis of linear-hyperbranched diblock copolymers consisting of a linear, organometallic poly(ferrocenylsilane) (PFS) block and hyperbranched poly(carbosilane) (hbPCS) segments. Linear PFS diblock copolymers were synthesized through photolytic ring-opening ...

We use the hybrid particle-Self Consistent Field calculation (hybrid particle-SCF) to study the distribution of particles in a multi-block copolymer nano-composite. Using the static approach, we first find the effective interaction potential between the nano-particles and the polymer. The interaction has an entropic and an enthalpic component. The dynamical simulation confirms ...

We report a simulated annealing study of the morphology of asymmetric diblock copolymer thin films confined between two homogeneous and identical surfaces. We have focused on copolymers that form a gyroidal morphology in the bulk. The morphological dependence of the confined films on the film thickness and the surface-polymer ...

We report a simulated annealing study of the morphology of asymmetric diblock copolymer thin films confined between two homogeneous and identical surfaces. We have focused on copolymers that form a gyroidal morphology in the bulk. The morphological dependence of the confined films on the film thickness and the surface-polymer ...

Block junctions are the topological constraints of connecting two homopolymers of different species to form diblock copolymers, which make the phase transition behaviors of diblock copolymers deviate from that of parallel polymer blends. We performed dynamic Monte Carlo simulations of these two parallel polymeric ...

Using the mesoscale simulation techniques, self-consistent field (SCF) method and dissipative particle dynamics (DPD), we study microphase separation in the melt of amphiphilic/nonpolar diblock copolymers. It is shown that the phase diagram for the melt of diblock copolymers with an amphiphilic block can be ...

Using the mesoscale simulation techniques, self-consistent field (SCF) method and dissipative particle dynamics (DPD), we study microphase separation in the melt of amphiphilic/nonpolar diblock copolymers. It is shown that the phase diagram for the melt of diblock copolymers with an amphiphilic block can be ...

Functionalizing nanoparticles with organic ligands, such as oligomers, polymers, DNA, and proteins, is an attractive way to manipulate the interfacial interactions between the nanoparticles and the medium the particles are placed in, and thus control the nanoparticle assembly. In this paper we have conducted a Monte Carlo simulation study on copolymer grafted spherical ...

Functionalizing nanoparticles with organic ligands, such as oligomers, polymers, DNA, and proteins, is an attractive way to manipulate the interfacial interactions between the nanoparticles and the medium the particles are placed in, and thus control the nanoparticle assembly. In this paper we have conducted a Monte Carlo simulation study on copolymer grafted spherical ...

Diblock copolymers order into a variety of periodic morphologies when the constituent blocks are sufficiently incompatible. Previous studies have demonstrated that classical dispersion (spherical and cylindrical) and lamellar morphologies, as well as complex morphologies (e.g., gyroid*, lamellar catenoid, and hexagonally perforated lamellae), can be ...

Four hydroxyl-terminated poly(isoprene-b-styrene) diblock copolymers with comparable molecular weights and compositions (equivalent volume fractions of polyisoprene and polystyrene) but different polystyrene block polydispersity indices (M(w)/M(n)=1.06,1.16,1.31,1.44) were synthesized by anionic polymerization using either sec-butyllithium or the ...

Four hydroxyl-terminated poly(isoprene-b-styrene) diblock copolymers with comparable molecular weights and compositions (equivalent volume fractions of polyisoprene and polystyrene) but different polystyrene block polydispersity indices (Mw/Mn=1.06,1.16,1.31,1.44) were synthesized by anionic polymerization using either sec-butyllithium or the functional ...

A series of diblock copolymers with one linear block and one dendrimeric block have been synthesized with the objective of forming ultrathin film nanoporous membranes. Polyethyleneoxide serves as the linear hydrophilic portion of the diblock copolymer. The hyperbranched dendrimeric block consists of polyamidoamine ...

Amphiphilic diblock copolymers composed of two covalently linked, chemically distinct chains can be considered to be biological mimics of cell membrane-forming lipid molecules, but with typically more than an order of magnitude increase in molecular weight. These macromolecular amphiphiles are known to form a wide range of nano-structures (spheres, worms, ...

... parameter for diblock copolymers on composition, monomer molecular structure ... polystyrene-b-poly(methyl methacrylate), polystyrene-b-poly (vinyl ...

... The ligands were synthesized using Diels-Alder chemistry to join the PS and PEG blocks into linear diblock copolymers, which were attached to ...

... of participating in the ring opening polymerization ... and Nylon 6 blocks were achieved. (jes). ... OPENING(PROCESS), BLOCK COPOLYMERS, BLOCK ...

... Title : Synthesis Characterization and Morphology of a Cis 1,4 Polyisoprene/Poly n-Butylmethacrylate Diblock Copolymer. ...

The surface-induced effect on the morphologies of lamella-forming diblock copolymers in nanorod arrays is studied by using the self-consistent field theory. In the simulation study, a rich variety of novel morphologies are observed by variations in the strength of the surface field for the diblock copolymers. ...

... Accession Number : ADA524373. Title : Self-Organization of FePt Nanoparticles on Photochemically Modified Diblock Copolymer Templates. ...

... case of planar slits without nanopatterns, we observe the formation of perpendicular and parallel lamellar phases with different numbers of lamellae ...

... slit widths, in addition to the formation of L� phases, the systems exhibit nanostructures characterized by a mixture of parallel and tilt lamellae (Fig. ...

-water mixture. The polymer was filtered and purified by Soxhlet extraction with methanol. Synthesis of PHT

... Reproduction in whole or in part is permitted ... disordered or homogeneous, while at low temperatures (or ... close to the order-disorder transition (ODT ...

... Our "SCE/DET" combines a self-consistent field theory (SCFT) for diblock copolymers and density functional theory (DFT) for particles to generate ...

... Hierarchical assemblies, including lamellae-within-lamellae and cylinders- within-lamellae, were simultaneously ordered and oriented from a few to ...

... Diblock copolymer composed of polystyrene and poly- isoprene, denoted PS-b-PI ... b-PEP) by selective hydrogenation of the polyisoprene block.15 ...

Formation of star-like nanogels with two different arms via cross-linking reaction of complementarily reactive diblock copolymers was successfully accomplished. The two types of diblock copolymers, consisting of poly(methyl methacrylate) (PMMA) or polystyrene (PSt) block and alkoxyamine-based cross-linkable block, ...

In this study the phase behavior of nanoparticle/diblock copolymer composites in dilute solution has been investigated by the hybrid particle-field (HPF) method. We focus on the influence of particle surface selectivity (i.e. hydrophobic and hydrophilic) on the distribution of nanoparticles in the micelles formed by the diblock ...

... Title : Effect of Molecular Weight of Added Polystyrene on the Order-Disorder Transition of Styrene-Butadiene Diblock Copolymer. ...

The objective of this research is to utilize continuous gradient techniques to systematically quantify film surface morphological transitions with changing substrate surface energy.

Living cationic polymerization reactions using organotellurium compounds as initiators are reported. Polymerization of vinyl ethers in the presence of an organotellurium initiator and a Lewis acid, such as In(OTf)(3) and BF(3)�OEt(2), affords well-controlled poly(vinyl ether)s with predetermined molecular weights and narrow molecular-weight distributions. Poly(meth)acrylates possessing ...

We study the numerical efficiency of solving the self-consistent field theory (SCFT) for periodic block-copolymer morphologies by combining the spectral method with Anderson mixing. Using AB diblock-copolymer melts as an example, we demonstrate that this approach can be orders of magnitude faster than competing methods, permitting ...

Three types of block copolymers were used to prepare block copolymer ionomers: (1) a triblock copolymer of styrene and ethylene-co-butylene (SEBS) obtained commercially and diblock and triblock copolymers of styrene and ethylene-co-propylene (SEP and SEPS...

Neutron reflectivity was used to observe the ordering of symmetric diblock copolymers in a supercritical carbon dioxide environment. The supercritical fluid was used to enhance the dynamics of the copolymer so as to enable ordering of the copolymer microdomains. The enhanced dynamics allowed very high molecular ...

Aqueous dispersions of thermosensitive gold nanoparticles protected by diblock copolymers of poly(ethylene glycol) and polyphosphoester were prepared and studied. Diblock copolymers MPEG-b-P(EEP-co-PEP) with different compositions that are composed of monomethoxy poly(ethylene glycol), random ...

In this work, anionic polymerization was used to synthesize "random diblock" copolymers where each block had a random composition of styrene/diene monomers. Consequently, by varying the ratio of styrene/isoprene contents in each block, diblock copolymers with desired order-disorder transition temperatures (TsbODT) ...

2-(Dimethylamino)ethyl methacrylate (DMA) was block copolymerized with methyl methacrylate (MMA) using group transfer polymerization to give four AB diblock, ABA triblock, and BAB triblock copolymers of low polydispersity (Mw/Mn < 1.20). In addition, a near-monodisperse styrene-functionalized DMA-based macromonomer was synthesized ...

This project focused on the fundamentals of microstructural control of polymer materials for three-dimensional nano-composites. Our recent discovery of the double gyroid (DG) micro-domain structure in a poly-styrene-polyisoprene di-block copolymer (Macrom...

- ments on the incorporation of several channel-forming peptides into diblock copolymer membranes). The simulation reflectivity data showed excellent agreement with experi- ments at low surface concentrations pressure ensemble.43 Murat and Grest were perhaps the first group to incor- porate polymer

... 1,4-poly(butadiene) / 1,4-poly(isoprene) block copolymers. ... lene rubber (EP). Polyisoprene of 100K molecular weight was also hydrogenated to ...

A high molecular weight polymer mixture was obtained from a sequential Ziegler-Natta polymerization of styrene and propylene. After removing unwanted homopolymers from the reaction product, the remaining copolymer was subjected to extensive molecular and ...

The thin film morphology of binary blends of poly(ethylene oxide)-block-poly(n-butyl methacrylate-random-propargyl methacrylate) (PEO-b-P(nBMA-r-PgMA)) diblock copolymer and Rhodamine B azide was investigated. During thermal annealing, the click reaction between the alkyne-bearing diblock copolymer and the azide ...

Morphological behavior of hydrogen-bonded self-assembled structures of blends of two diblock copolymers Poly(styrene-b-ethylene oxide) and poly(butadiene-b-acrylic acid) were studied by small angle x-ray scattering and transmission electron microscopy with a goal to obtain morphologies equivalent to triblock copolymers. Depending on ...

We analyze the phase behavior and the dynamic moduli of ternary mixtures composed of styrene-poor diblock (styrene-isoprene, SI) and triblock (SIS) copolymers in a midblock-selective solvent (squalane). In the absence of diblocks, macrophase separation is clearly observable at low triblock concentrations, while a percolated network is ...

With a view toward creating solid block copolymers wherein the order-disorder transition can be accessed many times they investigated the nature of order-disorder transitions in cross-linked diblock copolymer melts using synergistic theory and experiment. A mean-field theory based on a coarse grained free-energy and the Random Phase ...

A hybrid self-consistent field theory/density functional theory method is applied to predict tilt (kink) grain boundary structures between lamellar domains of a symmetric diblock copolymer with added spherical nanoparticles. Structures consistent with experimental observations are found and theoretical evidence is provided in support of a hypothesis ...

A hybrid self-consistent field theory/density functional theory method is applied to predict tilt (kink) grain boundary structures between lamellar domains of a symmetric diblock copolymer with added spherical nanoparticles. Structures consistent with experimental observations are found and theoretical evidence is provided in support of a hypothesis ...

Homogeneous anionic polymerization methods were employed to synthesize a diblock copolymer of the form (A)(n)-b-(B)(m) in which repeat unit A is isoprene, B is n-butylmethacrylate and b is a single unit of 1,1 diphenylethylene. Various physical-chemical c...

We formulate a viscoelastic theory for interconnected microphase separated structures such as a double gyroid in diblock copolymer melts. We consider the energy increase and the energy dissipation due to the deformation of interconnected periodic domains. The dominant elastic part agrees with previous analytical results obtained by a phase formulation of ...

The diblock copolymer, BP26, assembled into polymeric vesicles with double layers that formed a hydrophobic crystalline interior and a hydrophilic amorphous exterior in methanol, a selective solvent for the PEGT block. The vesicles were demonstrated to encapsulate a hydrophobic guest polyfluorene (PF). PMID:21423932

The physical properties of polyacetylene diblock copolymers containing polystyrene (PS) or polyisoprene (PI) blocks of various compositions are studied using electron spin resonance, resonance Raman scattering, and room temperature conductivity measurements. This study is performed to investigate the processability-conductivity correlation in these ...

The Scheutjens-Fleer(SF) theory, a self-consistent field theory, models the behavior of polymers at an interface. In these experiments the authors have observed the behavior of diblock copolymers at an air/water interface by the neutron reflection techniq...

Lamellar diblock copolymers are investigated under large amplitude oscillatory shear (LAOS) at temperatures close to the order-disorder transition temperature (TODT). Increasing strain amplitude leads to a double flip of orientation. The state of orientation depends on an effective shear rate as in similar experiments on lyotropic lamellar phases.

A novel set of diblock copolymers has been examined in various molecular and morphological characterization experiments, in small amplitude dynamic mechanical tests and in large deformation experiments. In all of the materials studied, one of the block se...

A high resolution negative-tone-type of inorganic-organic diblock copolymer photoresist was synthesized as a novel precursor for simple and direct fabrication of SiCN ceramic mesoporous patterns with ordered nanoscale pores by using a "top-down" photolithographic technique and the subsequent sacrificial processes of a "bottom-up" self-assembled ...

The authors have studied the effect of predeposition electron exposure on the diffusion behavior of silver evaporated on a diblock copolymer template. Unexposed regions display a highly selective adsorption of Ag clusters on the polystyrene domains. Exposure to the electron beam modifies the surface diffusion constants on each polymer block and produces a ...

... Accession Number : ADD442191. Title : Blends of Styrene-Maleic Anhydride Copolymer with ABS,. Corporate Author : Personal ...

... Title : Acrylonitrile-Butadiene-Styrene Copolymers (ABS): Pyrolysis and Combustion Products and their Toxicity-A Review of the Literature,. ...

The adsorption of copolymers of polystyrene and hydrogenated polyisoprene block copolymers adsorbed from cyclohexane onto carbon black has been investigated. The adsorption of the copolymers was found strongly dependent on copolymer composition. The conformation of the adsorbed polymer is largely determined by the ...

Self-assembly of diblock copolymers under soft confinement is studied systematically using a simulated annealing method applied to a lattice model of polymers. The soft confinement is realized by the formation of polymer droplets in a poor solvent environment. For diblock copolymers with various bulk phases, ...

We investigate the orientational order transition of striped patterns in microphase structures of diblock copolymer-diblock copolymer mixtures in the presence of periodic oscillatory particles. Under certain conditions, although the macrophase separation of a system is almost isotropic, microphase separation of one ...

Alkyne/azide click chemistry is shown as a novel approach to induce the disorder-to-order transition (DOT) of diblock copolymers. A series of poly(ethylene oxide)-b-poly(n-butyl methacrylate-r-propargyl methacrylate) (PEO-b-P(nBMA-r-PgMA)) diblock copolymers were prepared and it is shown that the neat ...

Brownian Dynamics simulations are carried out to understand the effect of temperature and dielectric constant of the medium on microphase separation of charged-neutral diblock copolymer systems. For different dielectric media, we focus on the effect of temperature on the morphology and dynamics of model charged diblock ...

Ordered diblock copolymer blends have recently become the subject of tremendous research interest since they can be used to elucidate the intramicrodomain segregation of blocks differing in length, as well as to identify the molecular and blend parameters yielding phase immiscibility. In this work, we explore the influence of molecular architecture on ...

In this work, an amphiphilic diblock copolymer (PEG(43) -b-PSDTE(29) ) bearing photochromic dithienylethene (DTE) pendants is synthesized by reversible addition fragmentation chain transfer radical polymerization. The diblock copolymer was characterized by spectroscopic methods and gel permeation chromatography. ...

A series of well-defined diblock copolymers, poly(ethylene oxide)-block-poly(4-vinylpyridine) (PEO-b-P4VP) used as physical coating of capillaries, were synthesized by atom transfer radical polymerization (ATRP). EOF measurement results showed that all synthesized PEO-b-P4VP diblock copolymer-coated capillaries in ...

Local control of the domain orientation in diblock copolymer thin films can be obtained by the application of electric fields on micrometer-length scales. Thin films of an asymmetric polystyrene-polymethylmethacrylate diblock copolymer, with cylindrical polymethylmethacrylate microdomains, were spin-coated onto ...

We have developed the theory for the micelle formation in dilute solution mixtures of A-B diblock copolymers and ionic surfactants S in polar selective solvents. In the case when soluble B-blocks are longer then A-blocks, spherical micelles with B-corona and A-core decorated by surfactant molecules S can be formed. The conditions for ...

Amphiphilic norbornene-b-(norbornene dicarboxylic acid) diblock copolymers with different block ratios were prepared as templates for the incorporation of iron ions using an ion exchange protocol. The disordered arrangement of iron oxide particles within these copolymers was attributed to the oxidation of the iron ions and the strong ...

The phase behavior of diblock copolymers near the order-disorder transition is studied using transmission electron microscopy, small-angle neutron scattering (SANS) and dynamical mechanical spectroscopy. For a series of polyolefin diblocks with volume fraction, f_1, of the block with the larger segment length in the range f_1 = 0.63 - ...

Novel surface-functionalized cross-linked nanogels were developed as a platform to allow conjugation of monoclonal antibodies (mAb) for targeted drug delivery. Well-defined diblock copolymers of poly(ethylene glycol)-b-poly(methacrylic acid) (PEG-b-PMA) with PEG terminal aldehyde functionality were synthesized by atom transfer radical ...

Using a self-consistent field theory (SCFT) framework, we explore the topic of self-assembly in a thin AB diblock copolymer melt confined to the surface of the sphere. This model is numerically simulated by spectral collocation with a spherical harmonic basis. The method allows us to investigate the lamellar and cylindrical phases on ...

A series of AB diblock copolymers consisting of poly(Lysine(Z)) (A = P(Lys(Z))) and poly(propylene oxide) or polyhedral oligomeric silsesquioxane (B = PPO, POSS) were synthesized and found to form stable, rigid organogels in THF and chloroform at room temperature. In these systems, the protecting group on the P(Lys) side-chains remains ...

A series of AB diblock and ABA triblock copolymers consisting of poly(Lysine(Z)) (A = P(Lys(Z))) and poly(propylene oxide) (B = PPO) were synthesized and found to form stable, rigid organogels in THF (ca. 1 1.5 wt.% solutions) at room temperature. In these systems, the protecting group on the P(Lys) side-chains remains intact. As ...

Combining the self-consistent field theory (SCFT) and the density functional theory (DFT), we investigated the self-assembly behavior of AB diblock copolymer tethered single spherical particle P (ABP molecules). Two cases were studied: one is where the particles are chemically neutral to both A and B blocks, and the other is where the ...

We simulate ABA triblock copolymer melts using a lattice Monte Carlo method, known as cooperative motion algorithm, probing various degrees of compositional asymmetry. Selected order-disorder transition lines are determined in terms of the segment incompatibility, quantified by product ?N , and the triblock asymmetry parameters, ? and ?. We correlate the results of the ...

Diblock copolymers poly (n-butylene oxide-b-ethylene oxide) (BOEO) with a variety of compositions were synthesized and employed as modifiers for epoxy resins. In blends of the diblock copolymers, epoxy resin (DER383), and curing agent (PN), the diblock copolymers form ...

Thin self-assembled nanocomposite films of an asymmetric diblock copolymer and nanoparticles are fabricated. The morphologies of the films of the diblock copolymer poly(styrene-block-n-butyl methacrylate), P(Sd-b-BMA), with different volume fractions of large magnetite Fe(3)O(4) nanoparticles are studied before and ...

Thin self-assembled nanocomposite films of an asymmetric diblock copolymer and nanoparticles are fabricated. The morphologies of the films of the diblock copolymer poly(styrene-block-n-butyl methacrylate), P(Sd-b-BMA), with different volume fractions of large magnetite Fe3O4 nanoparticles are studied before and ...

We use dynamic light scattering to measure the time-dependent increase of the average hydrodynamic radius of colloidal silica particles in the presence of salt. This increase appears to be linear in time up to twice the radius of unaggregated particles. The method is a very useful tool in monitoring the stabilizing effect of adsorbed polymers. Four different series of diblock ...

Solvent affinity drives the association of diblock co-polymers in selective solvents. The shape of the micelles is affected by the size of the blocks and their interaction with the solvent. Most experimental and theoretical studies have investigated solutions of diblocks with a relatively low incompatibility, requiring relatively large ...

The self-assembly of globular protein-polymer diblock copolymers into nanostructured phases is demonstrated as an elegant and simple method for structural control in biocatalysis or bioelectronics. In order to fundamentally investigate self-assembly in these complex block copolymer systems, a red fluorescent protein was expressed in E. ...

Our earlier work to correlate the transport measurements in diblock copolymer-ionic liquid mixtures was limited by our bulk samples that have only partial alignment. Here, thin films with perfect alignment of lamellar microdomains from mixtures of a poly(methyl methacrylate-b-styrene) diblock copolymer and an ionic ...

Self-assembling properties of di-block copolymers/ surfactant hybrids in aqueous solution can be exploited to obtain metal nanoparticles stable dispersion. Results will be presented here for polystyrene-block-poly(ethylene oxide) solutions. A SANS structural investigation has been performed over different molecular weights of both hydrophilic and ...

Adaptation of the Matsen and Bates BCP phase diagram predicted using Mean-field Theory. * Matsen MW, Bates FS, ''http://pubs3.acs.org/acs/journals/doilookup?in_doi=10.1021/ma951138i Unifying weak- and strong-segregation block copolymer theories. Diblock copolymer phase diagram as calculated using Mean-field Theory by Matsen and Bates, ...

Photophysical measurements have been used to characterize a series of well-defined block copolymers labeled with aromatic chromophores and quenchers. These include measurements of (1) energy migration kinetics in the homopolymers and diblock copolymers; (2) solvent effects (CH{sub 2}Cl{sub 2}, THF, THF/CH{sub 3}CN and CHCl{sub 3}) on ...

The principal goal of this research is to achieve the chemical labeling and surface modification of block copolymer vesicles (polymersomes) made from amphiphilic diblock copolymer Poly(butadiene-b-ethylene oxide) (PBd120- PEO89, MW 10400 g/mol) with the aim of developing possible drug carrier vehicles for controlled release of ...

We study the interfacial partitioning of poly(styrene-b-methyl methacrylate) (SM) diblock copolymers at interfaces between thin planar films of polystyrene (PS) and poly(methyl methacrylate) (PMMA) homopolymers. SM copolymers with constant PS and varying PMMA block lengths are incorporated into the top PS layer and the resulting ...

If block copolymers (e.g., AB block copolymers) are dissolved in a solvent which is a good solvent for one block, and a poor solvent for the other block, aggregates are formed under certain conditions. Commonly, it is assumed that spherical micelles are f...

A systematic coarse-graining procedure is proposed for the description and simulation of AB diblock copolymers in selective solvents. Each block is represented by a small number, nA or nB, of effective segments or blobs, containing a large number of microscopic monomers. nA and nB are unequivocally determined by imposing that blobs do ...

Conditions for the formation of gyroid structures in diblock copolymer solutions are examined using a simulated annealing technique. The simulations were performed on diblock copolymer systems of A(NA)-b-B(NB) (with NA

We report a new strategy for synthesizing temperature-responsive ?-Fe₂O₃-core/Au-shell nanoparticles (Au-mNPs) from diblock copolymer micelles. The amphiphilic diblock copolymer chains were synthesized using reversible addition fragmentation chain-transfer (RAFT) with a ...

We report a new strategy for synthesizing temperature-responsive γ-Fe2O3-core/Au-shell nanoparticles (Au-mNPs) from diblock copolymer micelles. The amphiphilic diblock copolymer chains were synthesized using reversible addition-fragmentation chain-transfer (RAFT) with a thermally responsive �smart� ...

Many exquisite structures formed by diblock copolymers have been studied rigorously over the past two decades. Using a symmetric polystyrene-poly(methyl methacrylate) diblock copolymer, we prepare thin films on a substrate which form lamellae oriented perpendicular to the film interfaces. These "edge-on" samples ...

Oligo(phenylenevinylene)-poly(ethyleneglycol) (OPV-PEG) diblock copolymers in tetrahydrofuran (THF) solution at concentrations of 5 to 25 gl self-assemble into rod-like structures with a radius of about 80 {angstrom} for an OPV-PEG diblock copolymer comprising 13 PV and 45 EG monomers. These aggregates consist of a ...

Self-assembling diblock copolymer thin films are an intriguing possible photolithography alternative for high-resolution patterning of advanced integrated circuit device elements. Cylindrical- and lamellar-phase materials spontaneously form patterns suggestive of contact-hole arrays and transistor gates at critical dimensions below 20nm. Besides high ...

Mixed micelles formed by critical micelle concentration (Cmc) character's diblock copolymer, and temperature-sensitive character's diblock copolymer were studied for their capabilities in improving stability with and without drug. Experimental results showed that this type of mixed micellar systems possessed ...

The geometric frustration phases are investigated for diblock copolymers in nanoparticles with neutral surfaces using real-space self-consistent field theory. First, a rich variety of geometric frustration phases with specific symmetries are observed in the polymer nanoparticles with invariable diameters by constructing the phase diagrams arranged as the ...

The order-to-disorder transition temperatures, T_ODT, in a diblock copolymer melt is used to measure the Flory-Huggins interaction parameter, \\chi, between the two constituent polymers. Poly(dimethylsiloxane) (PDMS), polyethyleneoxide (PEO) and the hydrocarbons poly(ethylene) (PE), poly(ethylenepropylene) (PEP) and poly(ethylethylene) (PEE) have been ...

The effects of thermal and solvent vapor annealing on the photovoltaic performance of a new class of all-conjugated poly(3-butylthiophene)-b-poly(3-hexylthiophene) diblock copolymer/PC(71)BM bulk heterojunction (BHJ) solar cells were scrutinized and theoretically analyzed using the single diode model combined with experimental measurements. The meanings of ...

Paclitaxel-loaded biodegradable drug delivery systems manufactured from poly(lactic-co-glycolic acid) (PLGA) are known to release the drug at extremely slow rates. The objective of this study was to characterize paclitaxel-loaded microspheres composed of blends of PLGA with low molecular weight ampipathic diblock copolymers. The encapsulation and release ...

We report a biocompatible polysiloxane containing amphiphilic diblock copolymer, poly(ethylene oxide)-block-poly(?-methacryloxypropyltrimethoxysilane) (PEO-b-P?MPS), for coating and stabilizing nanoparticles for biomedical applications. Such amphiphilic diblock copolymer which comprises both a hydrophobic segment ...

An MPEG-PCL diblock copolymer was synthesized as an in situ gel carrier, and its phase transition behavior in aqueous solutions was examined. For comparison, aqueous solutions of Pluronic F-127, a widely used injectable gel-forming solution, were also studied. Both MPEG-PCL copolymer and Pluronic aqueous solutions were sols at room ...

The specular reflectivity of neutrons has been used to characterize quantitatively the microphase separated morphology of symmetric, diblock copolymers of polystyrene (PS), and polymethylmethacrylate (PMMA), as a function of the total molecular weight of the copolymer where either block is perdeuterated. It is shown that the hyperbolic ...

Molecular Dynamics (MD) simulations are carried out to understand the physical aspects of different bulk morphologies formed in charged diblock copolymers. It has been seen that the bulk morphologies formed by charged block copolymers, 75 vol % fluorinated polyisoprene (FPI) - 25 vol% sulfonated polystyrene (PSS) with 50% sulfonation ...

AB diblock copolymers PS{sub 260}-b-PVP-C{sub n}X{sup -}{sub 240} (PS = polystyrene; PVP-C{sub n} = alkylated polyvinylpyridine); X{sup -} = I, Br{sup -}; n = 1, 4, 8, 10 have recently been found to self-assemble at the air/water interface to form circular structures referred to as surface micelles. These surface micelles are ordered ...

Three diblock copolymers of cis-1-4 polyisoprene (IR) and 1-4 polybutadiene (BR) have been studied in dynamic mechanical experiments, transmission electron microscopy and thermomechanical analysis. The block copolymers had molar ratios of 1/2, 1/1 and 2/1...

Sequential living anionic polymerization techniques were used for synthesis of block copolymers of styrene and tert-butyl methacrylate. Cumylpotassium and naphthalene-potassium complexes served as initiators for diblock and triblock copolymers, respective...

Microphase separation and liquid-crystalline ordering in diblock and triblock rod-coil copolymers (with rod-to-coil fraction f=0.5) were investigated using the dissipative particle dynamics method. When the isotropic disordered phases of these systems were cooled down below their order-disorder transition temperatures T(ODT), lamellar structures were ...

We report the formation of a double-gyroid network morphology in normal-tapered poly(isoprene-b-isoprene/styrene-b-styrene) [P(I-IS-S)] and inverse-tapered poly(isoprene-b- styrene/isoprene-b-styrene) [P(I-SI-S)] diblock copolymers. Our tapered diblock copolymers with overall poly(styrene) volume fractions of 0.65 ...

Page 1. 1 Spatial Position Control of CdS Nanoclusters using a Self-assembled Diblock Copolymer Template by Siao-Wei ...

(Gerjuoy, Rau, and Spruch, 1983; Balian and Veneroni, 1988) and references therein. 9 #12; 1. Restricted set that variational principles with the appropriate constraints could be helpful (Balian and Veneroni, 1988; Lacroix

Pure melts of asymmetric diblock copolymers are studied by means of the off-lattice Gaussian disphere model with Monte-Carlo kinetics. In this model, a diblock copolymer chain is mapped onto two soft repulsive spheres with fluctuating radii of gyration and distance between centers of mass of the spheres. ...

During the first year of this proposal significant strides have been made in understanding the nature of the interface in symmetric, diblock copolymers and the nature of the interface formed between immiscible homopolymers. Emphasis has been placed on the...

Poly(styrene-block-polyisoprene) (S-I) diblock copolymer melts with asymmetric volume fraction are shown to form an orthorhombic Fddd network structure, which Tyler et al. predicted with self-consistent field theory for diblock copolymer melts. The studies with small-angle X-ray scattering and transmission electron ...

... Using a 2.4 MPa applied stress on the channel die, the lamellae orient parallel to the plane of shear, while processing at an applied stress of 8.0 ...

periodic structures; for example lamellar, bcc centered spheres, circular tubes, and bicontinuous gyroids of the bicontinuous gyroid phase of Teramoto and Nishiura ([26]) indicate that this theory does predict rather. and Nishiura, Y.: Double Gyroid Morphology in a Gradient System with Nonlocal Effects. Journal of the Physical

A brief summary of the research on compatibilized polymer blends is presented. Of particular significance is the model system of crystallizable polybutadiene isomers: trans 1,4 polybutadiene and syndiotactic 1,2 polybutadiene. Appropriate blending procedu...

Precipitated blends of two crystallizable polybutadiene (PBD) isomers were characterized in terms of crystallization and phase behavior, morphology, and tensile mechanical properties. The isomers are syndiotactic 1,2 PBD and trans 1,4 PBD. As predicted by...