Dyre, Jeppe2; Olsen, Niels Boye2; Christensen, Tage Emil2
1 The Department of Science, Systems and Models, Roskilde University2 IMFUFA, Department of Science and Environment, Roskilde University
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.
Physical Review B. Condensed Matter and Materials Physics, 1996, Vol 53, Issue 5, p. 2171-2174