Abstract
A study of the effect of thermodynamic quality and viscosity of the solvent and of temperature on the negative thixotropy of poly(methyl methacrylate) solutions using criteria suggested in the preceding paper showed that the minimal shear stress is a more general criterion of hydrodynamic conditions of the formation of this effect than the minimal velocity gradient. It is assumed that the occurrence of negative thixotropy is due to the activation of macromolecules combined with their critical deformation and orientation caused by the effect of a certain minimal shear stress. A general quantitative relationship between the induction period and conditions of formation of the negative thixotropic structure was derived and experimentally tested.
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