On the mechanism of the highly viscous flow

Details On the mechanism of the highly viscous flow On the mechanism of the highly viscous flow

2011-02-10

arxiv.org/abs/1102.2177v2

J. Chem. Phys. 134, 224501 (2011)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 3 figures, 49 references; revised version accepted in Journal of Chemical Physics

Scientific paper

10.1063/1.3598506

The asymmetry model for the highly viscous flow postulates thermally activated jumps from a practically undistorted ground state to strongly distorted, but stable structures, with a pronounced Eshelby backstress from the distorted surroundings. The viscosity is ascribed to those stable distorted structures which do not jump back, but relax by the relaxation of the surrounding viscoelastic matrix. It is shown that this mechanism implies a description in terms of the shear compliance, with a viscosity which can be calculated from the cutoff of the retardation spectrum. Consistency requires that this cutoff lies close to the Maxwell time. The improved asymmetry model compares well with experiment.

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