English Abstract

Influence of Addition of Polyethylene -block- Polyacrylate Copolymer on Impact Strength of PP/EPDM/Talc Composites Kazuya NAGATA Shigeki HIKASA Katsushi NISHI Hitoshi IWABUKI Industrial Technology Center of Okayama Prefecture, Okayama, JAPAN Nippon Gomu Kyokaishi,(2006),79(5),267-270 Original Paper in Japanese Abstract The influence of addition of low density polyethylene -block- polyacrylate copolymer (PE-diblock) on the impact strength of ternary phase polypropylene (PP) composites containing ethylene-propylene-diene terpolymer (EPDM) and talc was investigated. The surface of talc was treated with 3-glycidoxypropyltrimethoxysilane (GPMS) in order to enhance the interaction between talc surface and the functional group (carboxy group) of the additive copolymers. The composites were prepared by twin-screw extruder. The impact strength of PP/EPDM(5 wt%)/talc(30 wt%) increased markedly with the addition of PE-diblock content up to 3 wt% and about 40% impact strength improvement was achieved for the composite by the addition of PE-diblock. Scanning electron micrograph observation of PP/EPDM/PE-diblock/GPMS-treated talc composite suggested that the edges of talc particles were included in elastomer phase on the basis of interaction between PE-diblock and elastomer. (Received on October 28, 2005) (Accepted on March 1, 2006) Keywords: Polypropylene, Talc, Composite, Polyethylene -block- polyacrylate Copolymer, Impact Strength

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