Institut für Festkörperforschung, Forschungszentrum Jülich, Postfach 1913, D-52425 Jülich, Federal Republic of Germany.
J Chem Phys. 2011 Jun 14;134(22):224501. doi: 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.
高度粘性流动的非对称模型假定热激活从实际上未变形的基态跃迁到强烈变形但稳定的结构，同时受到来自变形环境的显著埃舍尔比背应力。粘性归因于那些不回跳的稳定变形结构，而是通过周围粘弹性基质的松弛来松弛。结果表明，该机制意味着可以用剪切柔量来描述，并且可以从延迟谱的截止来计算粘性。一致性要求该截止接近麦克斯韦时间。改进的非对称模型与实验很好地吻合。
