Reinforcement of EPDM/SmBO3 and EPDM/ATO Composites by Four Polyolefins: Assessment of Branch Content and Crystallinity

Abstract

From Van Gurp plot, it was found that low-density polyethylene possesses long branches. The larger number of short branches would consume more peroxide and lower the maximum toque (M_H) in cure curves. Rheological studies show the complex viscosity of polypropylene (PP) is the highest among four polyolefins. But PP would undergo beta-scission, which would consume peroxide and also lower the M_H. Moreover, the acidic Sb-doped SnO₂ (ATO) would retard the cure and descend the chemical crosslink points, which would facilitate the motion of ethylene chain and enhance the crystallinity of polyolefin in ethylene-propylene-diene monomer composites.

Keywords

ethylene-propylene-diene rubber polyolefin rheological measurement Mooney viscosity swelling ratio mechanical and electrical properties.

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