Abstract
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. © 1996 The American Physical Society.
- Received 15 August 1995
DOI:https://doi.org/10.1103/PhysRevB.53.2171
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