Molecular theory of physical aging in polymer glasses

被引：68

作者：

Chen, Kang ^{[1
]}

Schweizer, Kenneth S. ^{[1
]}

机构：

[1] Univ Illinois, Dept Mat Sci, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.98.167802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A molecular level theory for the physical aging of polymer glasses is proposed. The nonequilibrium time evolution of the amplitude of long wavelength density fluctuations, and its influence on activated barrier hopping, plays an essential role. The theory predicts temperature-dependent apparent power-law aging of the segmental relaxation time and logarithmic aging of thermodynamiclike properties, in good accord with experiments. A physical origin for the quantitative nonuniversal aspects based on the amplitude of quenched density fluctuations is suggested.

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页数：4

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