Compatibility of the Polystyrene/Polyolefin Blends Containing Block Copolymers I. Processing Behaviour and Characterization

摘要

The processing behaviour and mechanical and thermal properties of the polystyrene/polyethylene or polystyrene/polypropylene blends containing block copolymers of KRATON type as compatibilizing agents have been studied. It has been established that the compounding on a twin screw extruder followed by #gamma#-irradiation assures satisfactory homogeneity of the blends and also good mechanical properties. A thermomechanical method was developed to characterize the blends. The variation of the #alpha#-relaxation or glass transition temperatures with blend composition as well as the variation of the other thermal characteristics such as melt flow rate, meling and crystallization temperatures, Vicat temperatures, etc., exhibit the important differences inrespect to the average values indicating a good compatibilization of the components.