Theoretical Predictions on Normal Stresses under Shear Flow in Transient Networks of Telechelic Associating Polymers

摘要: This paper studies the behavior of normal stresses in associated networks composed telechelic polymers under steady shear flow on basis a transient network theory. We numerically show that first and second stress coefficients reveal thickening as function rate, sign coefficient changes depending nonlinearity chain tension, dissociation rate associative groups from junctions, rate. By analytic calculation, we that, limit small shear-rate, inversion occurs by competition between nonlinear stretching groups. Thus, molecular mechanism is shown to be similar viscosity. also has origin. The theoretical predictions coefficient, positivity t...