Adsorption-entanglement layers in flowing high molecular weight polymer solutions IV. The rates of layer formation and decay

Abstract

Adsorption-entanglement layers are thick (i. e. multimolecular) layers which form at solid surfaces during flow of high molecular weight polymer solutions. This publication, the final part of the present series, is concerned with the rates at which such layers are formed and at which once formed they decay. It is shown that the rate of layer formation depends linearly on the shear rate applied. It is also demonstrated that the rate at which the layers decay is much slower than the rate at which they form. From the results presented in this paper, together with those in previous parts of this series [1–3], a qualitative model which accounts for the observed behaviour is deduced.