Rheology of Phase Separated Block Copolymer Melts

1989 ◽  
Vol 177 ◽  
Author(s):  
H. Henning Winter ◽  
Faith A. Morrison
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Single Crystals ◽  
Domain Structure ◽  
Shear Direction ◽  
Cylindrical Domain ◽  
Global Order ◽  
Copolymer Melts ◽  
Cylindrical Domains ◽  
Hexagonally Ordered

Flow can transfer the microphase separated morphology of block copolymers into a state of global order. For tri-block copolymers with cylindrical domains, this has been demonstrated by Folkes et al. (1973) and Hadziioannou et al. (1979). who established the existence of ‘single crystals’ of hexagonally ordered cylinders with uniform director throughout a sheared sample. The director is aligned with the shear direction. In this study, we investigate the flow induced ordering of cylindrical domain structure at increasing levels of shear.

Block Copolymers: Thermodynamics, Dynamics, and Small-Angle Scattering

2015 ◽  
Author(s):  
Lee M. Trask ◽  
Nacu Hernandez ◽  
Eric W. Cochran
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Small Angle ◽  
Self Assembly ◽  
Microphase Separation ◽  
Small Angle Scattering ◽  
Angle Scattering ◽  
Copolymer Melts ◽  
Shear Processing ◽  
Kinetics Of

This article explores the dynamics, thermodynamics, and small-angle scattering of block copolymers. The goal is to determine what drives the applications of block copolymers, i.e. how block copolymers behave and how they are characterized. The article begins with a summary of the experimental data and various theories that comprise our understanding of block copolymer thermodynamics, with particular emphasis on phase behavior and especially the theory of microphase separation. It then considers topics related to block copolymer dynamics, including diffusion, viscoelasticity and rheology, shear-processing, and the kinetics of self-assembly. It also discusses small-angle scattering techniques as applied to block copolymer characterization, including scattering from ordered block copolymer melts.

“Aggregation in Block Copolymer Solutions”

1989 ◽  
Vol 177 ◽  
Author(s):  
M. Olvera de la Cruz
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Solvent Effects ◽  
Microphase Separation ◽  
New Materials ◽  
Ordered Structures ◽  
Copolymer Concentration ◽  
Semidilute Solutions ◽  
Copolymer Melts ◽  
Block Sizes

ABSTRACTThe ability to produce block copolymers has led to new materials with unique properties. The chemical connectivity of incompatible blocks forces segregation to occur at distances of the order of the block sizes. In block copolymer melts, the segregated domains form periodic ordered structures called microphases. Most block copolymers are strongly incompatible. In such cases, in order to ensure equilibrium microphase separated samples, the microphases are prepared from solution. Microphase separation in semidilute solutions of block copolymers in nonselective good solvent is analyzed. The solvent effects on the thermodynamics in the weak segregation limit are discussed. The concentration of block copolymer at the transition in good solvents, scales as φtN−.62and in ϑ solvents as N−.5. The transitions between microphase morphologies as a function of block copolymer concentration are studied.

Carboxyl-functionalized nanochannels based on block copolymer hierarchical structures

2018 ◽  
Vol 209 ◽  
pp. 303-314 ◽  
Author(s):  
Valentina-Elena Musteata ◽  
Stefan Chisca ◽  
Florian Meneau ◽  
Detlef-M. Smilgies ◽  
Suzana P. Nunes
Keyword(s):  
Phase Separation ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Growth Mechanism ◽  
Butyl Acrylate ◽  
Hierarchical Structures ◽  
Nucleation And Growth ◽  
Porous Structures ◽  
Hexagonally Ordered ◽  
Nucleation And Growth Mechanism

Hierarchical isotropic porous structures with spherical micrometer-sized cavities, interconnected by hexagonally ordered nanochannels, were prepared based on the phase separation of polystyrene-b-poly(t-butyl acrylate) block copolymers, following a nucleation and growth mechanism.

Lattice self-consistent field calculations of confined symmetric block copolymers of various chain architectures

Soft Matter ◽  
2020 ◽  
Vol 16 (17) ◽  
pp. 4311-4323
Author(s):  
Jingxue Zhang ◽  
Jiaping Wu ◽  
Run Jiang ◽  
Zheng Wang ◽  
Yuhua Yin ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Chain Architecture ◽  
Consistent Field ◽  
Copolymer Melts ◽  
Structural Details ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Symmetric Block

The effects of chain architecture on the structural details and orientation of confined lamellae formed by symmetric AB-type block copolymer melts are studied.

MACROSCOPIC " SINGLE CRYSTALS " OF AN S-B-S THREE BLOCK COPOLYMER

1971 ◽  
Vol 32 (C5) ◽  
pp. C5a-295-C5a-300
Author(s):  
A. KELLER ◽  
J. DLUGOSZ ◽  
M. J. FOLKES ◽  
E. PEDEMONTE ◽  
F. P. SCALISI ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Single Crystals

Investigation of the domain structure and hierarchy in potassium–sodium niobate lead-free piezoelectric single crystals

RSC Advances ◽  
2016 ◽  
Vol 6 (54) ◽  
pp. 49060-49067 ◽  
Author(s):  
Micka Bah ◽  
Natalya Alyabyeva ◽  
Richard Retoux ◽  
Fabien Giovannelli ◽  
Mustapha Zaghrioui ◽  
...  
Keyword(s):  
Single Crystals ◽  
Domain Structure ◽  
Lead Free ◽  
Nanometer Scale ◽  
Sodium Niobate ◽  
Potassium Sodium Niobate ◽  
Length Scales ◽  
Potassium Sodium ◽  
Domain Structures ◽  
Self Organized

We reported self-organized and hierarchized domain structures on various length scales ranging from micrometer to nanometer scale in K0.5Na0.5NbO3 crystals.

Fabrication of convex lens-shaped polymer particles by tuning the interfacial interaction

2017 ◽  
Vol 1 (3) ◽  
pp. 507-511 ◽  
Author(s):  
Jiangping Xu ◽  
Yi Yang ◽  
Ke Wang ◽  
Yuqing Wu ◽  
Jintao Zhu
Keyword(s):  
Block Copolymers ◽  
Small Molecules ◽  
Interfacial Interaction ◽  
Polymer Particles ◽  
Emulsion Droplets ◽  
Convex Lens ◽  
Cylindrical Domains

With the addition of small molecules to emulsion droplets containing block copolymers, anisotropic convex lens-like particles with hexagonally stacked cylindrical domains can be readily achieved by using a single surfactant to create a neutral interface for both blocks.

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