Dielectric behaviour of poly(sulfonyl‐1‐butylethylene) in concentrated solutions

Abstract

Measurements of the dielectric relaxation of three poly(sulfony1-I-butylethylene)s, (PSB), of different molecular weights were carried out in benzene solutions of polymer contents from 3,O to 50,O wt.-%. It was found that the distribution parameter of the dielectric relaxation time was constant above a critical polymer contents and the activation energy increased with polymer contents. The observed relaxation time was analyzed by Frdhlich's theory assuming limiting relaxation times. The lower limit in the relaxation time, T~, was independent of polymer contents above the critical polymer contents, in contrast to the upper limit relaxation time, r,, which depended on polymer contents. The polymer contents dependence of the critical frequency below and above the critical polymer contents was interpreted by the free volume effect. The unperturbed molecular dimension at the critical polymer contents was also discussed.