Part I. Morphology and Thermophysical Properties

Abstract: Various concentrations of polypropylene (PP) and polystyrene (PS) blends were prepared with styrene-ethylene/butylene-styrene block copolymer (SEBS) added as a compatibilizer between the two main polymers. We have inves-tigated the effect of SEBS on processing, morphology and thermophysical proper-ties of the blends. The compatibilizing agent improves the blend morphology since smaller particles of the dispersed PS phase in the PP matrix blends are obtained; adding more than 5 % SEBS has no further effect on the blends. The presence of SEBS lowers the crystallinity of the PP-rich phase- as reflected in the enthalpy of fusion and also in the enthalpy of crystallization