高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (10): 1607.

• 研究快报 • 上一篇    下一篇

新型单茂钛催化剂乙烯均聚反应合成支化聚乙烯

祝方明, 方玉堂, 陈汉斌, 林尚安   

  1. 中山大学高分子研究所, 广州 510275
  • 收稿日期:2000-03-09 出版日期:2000-10-24 发布日期:2000-10-24
  • 通讯作者: 祝方明(1965年出生),男,博士,副教授,从事高分子化学与物理研究.
  • 基金资助:

    国家自然科学基金(批准号:2934010)资助.

Synthesis of Branched Polyethylene by Ethylene Homopolymerization with Novel Mono-titanocene Catalysts

ZHU Fang-Ming, FANG Yu-Tang, CEHN Han-Bin, LIN Shang-An   

  1. Institute of Polymer Science, Zhongshan University, Guangzhou 510275, China
  • Received:2000-03-09 Online:2000-10-24 Published:2000-10-24

关键词: 茂钛催化剂, 甲基铝氧烷, 聚乙烯, 支化聚乙烯

Abstract: Branched polyethylene was synthesized by ethylene homopolymerization in the presence of a novel metallocene complex of η5-pentamethylcyclopentadienyl tribenzyloxy titanium[Cp*Ti(OBz)3] activated by four types of modified methylaluminoxanes(mMAO) which contained different amounts of residual trimethylaluminum(TMA). The activity of catalyst and molecular weight, branched degree and branch length of the resultant polymers depend on the oxidation states of active species of titanium and polymerization temperature. The higher content(%) of residual TMAin mMAOcould strongly reduce complexes Ti(Ⅳ) to Ti(Ⅲ) and Ti(Ⅱ) and Ti(Ⅳ) active species was suggested to be more effective for ethylene polymerization. The products obtained were confirmed by 13C NMRand IRspectra charac-terization to be branched polyethylene with isolated long branch and methyl pendant. There is a remar-kable increase in proportion of methyl pendant with the increase of polymerization temperature.

Key words: Titanocene, Methylaluminoxane, Polyethylene, Branched polyethylene

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