Calorimetric investigations of glass transitions and phase systems of poly(arylate-arylenesulfone oxide) block copolymers

Statistical poly(arylate-arylenesulfone oxide) block copolymers derived from phenolphtalein, terephthaloyl chloride and polyarylene sulfone oxide with degree of polymerisation, DP:10, DP:30 and DP:100 were investigated by DSC-2. The investigations were carried out on the systems containing from 0.5% to 90% arylenesulfone oxide. The aim of this work is to study the influence of degree of polymerisation of arylenesulfone oxide on the phase behaviour of the block copolymer. The results indicate that in the case of DP:10 there was a single phase system with a single glass transition temperature, which follows the commonly used T g -composition relations. For all compositions the block copolymers with DP:30 and DP:100 showed a multiphase behaviour with two glass transition regions.