Glass Transition Temperature of 2, 3-Epithiopropyl Methacrylate-p-Chlorostyrene Copolymers

Abstract

2, 3-Epithiopropyl methacrylate-p-chlorostyrene copolymers were prepared by solution pdymerization in benzene. The molecular weight and the composition of the copolymers were determined by gel permeation chromatography and the chlorine content of the copolymers, respectively, The copolymers were fractionated by the addition of n-butanol to a copolymer solution in benzene. The glass transition temperature (T_g) was detemined by differential scanning calorimetry. The TT_g of the copolymers increased with increasing molecular weight and p-chlorostyrene moiety in the copolymers. The relation between T_g and 1/MT_w gave a straight line for each copolymer. The unfractionated and fractionated copolymers showed almost the same TT_g.