Additional Effect of SEBS on Dynamic Mechanical Properties in iPP/aPS Blends

Abstract

Dynamic mechanical properties of binary and ternary blends of isotactic polypropylene (PP), atactic polystyrene (PS) and poly(styrene-b-ethylene-co-butylene-b-styrene (SEBS)) were investigated. The glass transition temperature of PS domains in PP/PS and PP/PS/SEBS composites becomes higher with PP content owing to the low activation entropy of the glass transition of PS domains. The PS domain size and the relaxation strength of the PS glass transition decrease by the increase of SEBS for PP/PS/SEBS composites with less than 2.5 phr SEBS content, while the domain size and the relaxation strength become constant for the composites with over 2.5 phr SEBS content.