Effect of Dynamic Vulcanization on the Structure and Properties of Polypropylene/Rubber Mixtures Studied by Positron Annihilation and Thermostimulated Luminescence Techniques

摘要

The structure of isotactic polypropylene (PP) and its blends with ethylcne-propylene-dicne terpolymer EPDM (0-100%) containing the unvulcanized and the vulcanized rubber phase were studied using positron annihilation lifetime (PAL) spectroscopy technique and thermostimulated luminescence (TSL). Cross-linking in the polymer blends is one of the effective ways to create novel materials with effective industrial properties. Meanwhile, composition of such systems is very complicated since it contains microphases of the dispersed components, cross-linked or not, elements of the cross-linking agents, which have some distribution between the blend components. This distribution, heterogeneity and also variation of elementary free volumes due to cross-linking are the points of interest in the study of polymer blend structures.