Self-Assembly of Lamellar Microphases in Linear Gradient Copolymer Melts

2010 ◽  
Vol 43 (24) ◽  
pp. 10612-10620 ◽  
Author(s):  
Nicholas B. Tito ◽  
Scott T. Milner ◽  
Jane E. G. Lipson
Keyword(s):  
Self Assembly ◽  
Linear Gradient ◽  
Gradient Copolymer ◽  
Copolymer Melts

scholarly journals Phase Behavior of Gradient Copolymer Melts with Different Gradient Strengths Revealed by Mesoscale Simulations

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2462
Author(s):  
Pavel Beránek ◽  
Paola Posocco ◽  
Zbyšek Posel
Keyword(s):  
Self Assembly ◽  
Diblock Copolymers ◽  
Block Size ◽  
The Self ◽  
Gradient Copolymers ◽  
Gradient Copolymer ◽  
Gradient Strength ◽  
Monomer Sequence ◽  
Copolymer Melts ◽  
Weak Gradient

Design and preparation of functional nanomaterials with specific properties requires precise control over their microscopic structure. A prototypical example is the self-assembly of diblock copolymers, which generate highly ordered structures controlled by three parameters: the chemical incompatibility between blocks, block size ratio and chain length. Recent advances in polymer synthesis have allowed for the preparation of gradient copolymers with controlled sequence chemistry, thus providing additional parameters to tailor their assembly. These are polydisperse monomer sequence, block size distribution and gradient strength. Here, we employ dissipative particle dynamics to describe the self-assembly of gradient copolymer melts with strong, intermediate, and weak gradient strength and compare their phase behavior to that of corresponding diblock copolymers. Gradient melts behave similarly when copolymers with a strong gradient are considered. Decreasing the gradient strength leads to the widening of the gyroid phase window, at the expense of cylindrical domains, and a remarkable extension of the lamellar phase. Finally, we show that weak gradient strength enhances chain packing in gyroid structures much more than in lamellar and cylindrical morphologies. Importantly, this work also provides a link between gradient copolymers morphology and parameters such as chemical incompatibility, chain length and monomer sequence as support for the rational design of these nanomaterials.

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.

The effects of geometry and chemistry of nanopatterned substrates on the directed self-assembly of block-copolymer melts

2015 ◽  
Author(s):  
Grant Garner ◽  
Lance Williamson ◽  
Robert Seidel ◽  
Paulina Rincon Delgadillo ◽  
Su-Mi Hur ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Copolymer Melts

Synthesis and self-assembly of amphiphilic gradient copolymer via RAFT emulsifier-free emulsion polymerization

2012 ◽  
Vol 369 (1) ◽  
pp. 46-51 ◽  
Author(s):  
Yanjun Chen ◽  
Wen Luo ◽  
Yifeng Wang ◽  
Chong Sun ◽  
Mei Han ◽  
...  
Keyword(s):  
Emulsion Polymerization ◽  
Self Assembly ◽  
Gradient Copolymer

Self-assembly of fluorinated gradient copolymer in three-dimensional co-flow focusing microfluidic

2018 ◽  
Vol 526 ◽  
pp. 75-82 ◽  
Author(s):  
Chengzhi Zhu ◽  
Rongyi Yao ◽  
Yanjun Chen ◽  
Mengran Feng ◽  
Shuai Ma ◽  
...  
Keyword(s):  
Self Assembly ◽  
Three Dimensional ◽  
Flow Focusing ◽  
Gradient Copolymer
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