Local elastic expansion model for viscous-flow activation energies of glass-forming molecular liquids

被引：276
|
作者：
Dyre, JC
Olsen, NB
Christensen, T
机构：
[1] Department of Mathematics and Physics (IMFUFA), Roskilde University, DK-4000 Roskilde
来源：
PHYSICAL REVIEW B | 1996年 / 53卷 / 05期
关键词：
D O I：
10.1103/PhysRevB.53.2171
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A model for the viscosity of glass-forming molecular liquids is proposed in which a ''flow event'' requires a local volume increase. The activation energy for a flow event is identified with the work done in shoving aside the surrounding liquid; this work is proportional to the high-frequency shear modulus, which increases as the temperature decreases. The model is confirmed by experiments on a number of molecular liquids.
引用
收藏
页码：2171 / 2174
页数：4
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