Translation-rotation paradox for diffusion in glass-forming polymers: The role of the temperature dependence of the relaxation time distribution

被引：119

作者：

Hall, DB ^{[1
]}

Dhinojwala, A ^{[1
]}

Torkelson, JM ^{[1
]}

机构：

[1] NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.79.103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Comparisons are made of the translational and rotational diffusion of small-molecule probes in a polymer near its glass transition temperature, T-g. In the rubbery state, 1.1T(g) > T > T-g translational diffusion is much less temperature dependent than rotational reorientation; in a ''quenched'' glass, translation and rotation have similar temperature dependencies. This is explained to be a consequence of the fact that in the rubbery state near T-g the breadth of the polymer relaxation distribution is strongly temperature dependent, while in the quenched glass it is temperature invariant.

引用

页码：103 / 106

页数：4

共 27 条

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