文献类型：期刊文献

英文题名：α-olefin homopolymerization and ethylene/1-hexene copolymerization catalysed by novel ansa-group IV complexes/MAO system

作者：Yang, Xiaoxia; Zhang, Yong; Huang, Jiling

机构：[1]E China Univ Sci & Technol, Organomet Chem Lab, Shanghai 200237, Peoples R China

年份：2007

卷号：21

期号：10

起止页码：870

外文期刊名：APPLIED ORGANOMETALLIC CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000250629100008)】；

语种：英文

外文关键词：ansa-metallocene; alpha-olefin; ethylene polymerization; copolymerization

摘要：The catalytic properties of a set of ansa-complexes (R-Ph)(2)C(Cp)(Ind)MCl2 [R =Bu-t, M = Ti (3), Zr (4) or Hf (5); R = MeO, M = Zr (6), Hf (7)] in a-olefin homopolymerization and ethylene/1-hexene copolymerization were explored in the presence of MAO (methylaluminoxane). Complex 4 with steric bulk Bu-t group on phenyl exhibited remarkable catalytic activity for ethylene polymerization. It was 1.6-fold more active than complex 11 [Ph2C(CP)(Ind)ZrCl2] at 11 atm. ethylene pressure and was 4.8-fold more active at 1 atm pressure. The introduction of bulk substituent tBu into phenyl groups not only increased the catalytic activity greatly but also enhanced the content of 1-hexene in ethylene/1-hexene copolymerization. The highest 1-hexene incorporation was 25.4%. In addition, 4 was also active for propylene and 1-hexene homopolymerization, respectively, and low isotactic polypropylene (mmmm = 11.3%) and isotactic polyhexene (mmmm = 31.6%) were obtained. Copyright (C) 2007 John Wiley & Sons, Ltd.