EFFECT OF THE PARTIAL CROSSLINKING OF TERNARY ETHYLENE-PROPYLENE RUBBER (SKEPT) ON THE ELASTIC STRENGTH PROPERTIES OF POLYPROPYLENE-SKEPT BLENDS

摘要

The preparation of thermoplastic polyolefins based on blends of polypropylene with different proportions of ethylene-propylene-diene rubber of different copolymer compositions, partially crosslinked by vulcanisation with various proportions of a sulphur-based vulcanisation agent was investigated by viscosity (capillary viscometer), tensile strength and elongation at break measurements. The effects of partial crosslinking of the rubber on elastic strength of the blend are discussed in terms of the formation of graft copolymers which act as compatibilisers and the increase in effective molecular weight of the rubber, leading to increased entanglement