ナノシリカ／カーボンブラック複合フィラーにおけるカーボンブラック粒子形状の違いが本系複合フィラーを用いたポリプロピレン系コンポジットの力学特性に及ぼす影響

抄録

The aim of the present study is to elucidate the possibility of improvement of filler dispersibility and mechanical properties of silica/polypropylene (PP) composite systems with hybridized hydrophilic silica nanofillers with carbon black (CB) particles, silica@CB hybridized fillers. The (silica@CB)/PP composites were fabricated by blending PP with the silica@CB fillers prepared using a type of either high structure CB (HSCB) possessing increased degree of branching of the aggregates of CB primary particles or single sphere-typed low structure CB (LSCB) particles. It was found from the tensile tests of the PP composites that the tensile strength of PP could be increased substantially by adding the silica@HSCB hybridized fillers. Compared to the composite system with silica nanofillers alone, an improvement of silica filler dispersibility and elongation property could be observed in the cases of the (silica@CB)/PP composites, especially, the PP composites with the silica@LSCB hybridized fillers. It was also clarified that a remarkable increment in Charpy impact toughness of PP could be achieved by adding the silica@LSCB fillers. The results obtained in this study implied that shape of CB particles (i.e., structure level of CB) in the silica@CB fillers might be one of the crucial factors exerting an influence on mechanical properties of the PP composites with their hybridized fillers.