MECHANISMS OF CHAIN DIFFUSION IN LAMELLAR BLOCK-COPOLYMERS

被引：179

作者：

LODGE, TP

DALVI, MC

机构：

[1] Department of Chemistry, University of Minnesota, Minneapolis

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.75.657

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of chain diffusion in macroscopically oriented, well-entangled lamellar block copolymers. Diffusion in the lamellar plane is proposed to occur by an ''activated reptation'' mechanism when the composition profile is roughly sinusoidal. At higher degrees of segregation a crossover to an entropically limited ''block retraction'' mechanism is apparent. Diffusion through the layers reflects a thermodynamic barrier determined by the combination of temperature and molecular weight.

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页码：657 / 660

页数：4

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