Formation of Nonclassical Ordered Phases of AB-Type Multiarm Block Copolymers

被引：83

作者：

Gao, Ya ^{[1
]}

Deng, Hanlin ^{[1
]}

Li, Weihua ^{[1
]}

Qiu, Feng ^{[1
]}

Shi, An-Chang ^{[2
]}

机构：

[1] Fudan Univ, State Key Lab Mol Engn Polymers, Collaborat Innovat Ctr Polymers & Polymer Composi, Dept Macromol Sci, Shanghai 200433, Peoples R China

[2] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 06期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金;

关键词：

DIBLOCK COPOLYMER; BINARY MESOCRYSTALS; POLYMERS; BEHAVIOR; LITHOGRAPHY;

D O I：

10.1103/PhysRevLett.116.068304

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The formation of ordered phases from block copolymers is driven by a delicate balance between the monomer-monomer interaction and chain configurational entropy. The configurational entropy can be regulated by designed chain architecture, resulting in a new entropy-driven mechanism to control the self-assembly of ordered phases from block copolymers. An effective routine to regulate the configurational entropy is to utilize multiarm architecture, in which the entropic contribution to the free energy could be qualitatively controlled by the fraction of bridging configurations. As an illustration of this mechanism, the phase behavior of two AB-type multiarm block copolymers, B-0 - (B-i -A(i))(m) and (B-1 - A(i) - B-2)(m) where the minority A blocks form cylindrical or spherical domains, are examined using the self-consistent field theory (SCFT). The SCFT results demonstrate that the packing symmetry of the cylinders or spheres can be controlled by the length of the bridging B blocks. Several nonclassical ordered phases, including a novel square array cylinder with p4mm symmetry, are predicted to form from the AB-type multiarm block copolymers.

引用

页数：6

共 45 条

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