Heterophasic copolymerization of ethylene-propylene using Me<SUB>2</SUB>Si(2-Me-4-PhInd)<SUB>2</SUB>ZrCl<SUB>2</SUB> supported on SiO<SUB>2</SUB> and SiO<SUB>2</SUB>-MgCl<SUB>2</SUB> carriers
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초록
내용
Sequential polymerization is one of the most efficient method for improving the morphology and mechanical strength of reactor blended isotactic polypropylene (iPP) with other polyolefins. In this study, copolymerization of ethylene with iPP matrix using SiO2/MgCl2 binary supported Me2Si(2-Me-4-PhInd)2ZrCl2 catalyst was investigated. The synthesized metallocene catalysts were surface modified with various aluminum alkyls such as trimethylaluminum (TMA), triethylaluminum (TEAL), and triisobutylaluminum (TIBAL). Consequently, the prepared bi-supported metallocene catalyst were characterized using SEM, XPS, BET, and ICP in order to compare the different alkyl aluminum used.