Viscoelastic retardation of liquid mixtures

Abstract

The components of the complex retardational compliance have been determined for a series of mixtures of tri(m-tolyl) phosphate and di(n-butyl) phthalate. In the high viscosity region the complex compliance is described by J^*(jω)=J_∞+ 1/jωη+J_r/(1+jωτ_r)^β which is analogous to an equation used by Davidson and Cole in dielectric studies. The values of the retardational compliance J_r and the parameter β vary systematically with mole fraction, the values of J_r are from 3.3 to 8.6 times the limiting high frequency compliance J_∞ and the values of β vary from 0.4 to 0.7. In general, the temperature dependence of the characteristic retardation time τ_r differs from that of the Maxwell relaxation time τ_m=_ηJ_∞.