INFLUENCE OF THE DISPERSED PHASE COMPOSITION ON THE MECHANICAL PROPERTIES OF TOUGHENED PP TERNARY BLENDS

摘要

Polymer blends offer nowadays a quick and economic way of improving properties at competitive costs. Such blends have already reached a massive application in the case of thermoplastics. This work presents results obtained for blends of polypropylene (PP), linear low-density polyethylene (LLDPE) and ethylene-propylene rubbers (EPR or EPDM). Different dispersed phase particle sizes are obtained varying the content of LLDPE and the viscosity of elastomers. The morphological features of such blends prepared in a twin screw extruder have been studied by TEM. Notched Charpy impact resistance of injection-molded samples was determined at different temperatures. Fracture surfaces were observed by SEM and elastic modulus were measured and correlated with dispersed phase composition.