화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.18, No.6, 2217-2224, November, 2012
DOI10.1016/j.jiec.2012.06.021  Export Citation
Synthesis of (co-)polyethylene with broad molecular weight distribution by the heterogenous Ziegler-Natta catalysts via one-pot strategy
Zhi Liu, Xinli Zhang, Haibing Huang, Jianjun Yi1, Wei Liu, Weijiao Liu, Hongpeng Zhen, Qigu Huang†, Kejing Gao1, Mingge Zhang1, and Wantai Yang
  • State Key Laboratory of Chemical Resource Engineering, Key Laboratory of carbon fiber and functional polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China
  • 1Lab for Synthetic Resin Research Institution of Petrochemical Technology, China National Petroleum Corporation, Beijing 100083, China
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A new method was presented for preparing (co-)polyethylene with broad molecular weight distribution (MWD) and high molecular weight employed by the novel heterogeneous Ziegler-Natta catalysts via one-pot strategy. The preparation of these catalysts involved the introduction of alkoxy silane compounds as electron donors. The influences of the electron donors structure, as well as polymerization conditions such as temperature, molar ratio of Al/Ti, ethylene pressure and the concentration of 1-hexene in feed on the polymerization performance for ethylene (co-)polymerization, were investigated. The morphology of the catalyst particles was characterized by SEM and Ti content of these catalysts was characterized by ICP. The GPC results showed that the obtained homopolyethylene and ethylene/1-hexene copolymer had the widest molecular weight distribution up to ca 50 when diethoxy-isopropoxy-(t-butoxy)-silane (ED3) was used as internal electron donor. The 13C NMR and FT-IR analysis indicated that these catalysts efficiently catalyzed the copolymerization of ethylene with 1-hexene.
Keywords:Heterogeneous Ziegler-Natta catalyst;Ethylene polymerization;Broad molecular weight distribution
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