Effects of polydispersity on phase behavior of diblock copolymers

被引：142

作者：

Cooke, David M. ^{[1
]}

Shi, An-Chang ^{[1
]}

机构：

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

来源：

MACROMOLECULES | 2006年 / 39卷 / 19期

关键词：

BLOCK-COPOLYMERS; SUPERMOLECULAR STRUCTURES; MICROPHASE-SEPARATION; INHOMOGENEOUS POLYMERS; STATISTICAL-MECHANICS; ORDERED PHASES; MELTS; TRANSITION; CHAINS; LAYERS;

D O I：

10.1021/ma060717s

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The influence of polydispersity on the phase behavior of diblock copolymer melts is studied using a self-consistent field theoretic model. A perturbation theory is developed for the polydisperse system, in which the polydispersity index, kappa = M-w/M-n - 1, is taken as a perturbation parameter. Phase diagrams are constructed using the reciprocal space method. It is found that the order-disorder transition boundary shifts to higher temperatures, as predicted by a random phase approximation analysis. For asymmetric polymer distributions, polydispersity favors structures with curved interfaces. The domain spacing of the ordered structures increases with increasing polydispersity index. An analysis of the free energy provides an understanding of the mechanism of these effects.

引用

页码：6661 / 6671

页数：11

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