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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2002, Vol. 3 Issue (2): 148-150    DOI: 10.1631/jzus.2002.0148
Chemical & Energy Engineering     
Ethylene polymerization with novel silicon bridged homo-dinuclear cyanoethyl cyclopentadienyl complexes of titanium and zirconium
SUN Jun-quan, LIANG Cheng-feng, YANG Yong-rong, Schumann H.
College of Material and Chemical Engineering, Zhejiang University, Hangzhou 310027, China; Institute of Inorganic and Analytical Chemistry, Berlin University of Technology, Berlin 10623, Germany
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Abstract  Novel homo-dinuclear silicon bridged cyanoethyl cyclopentadienyl complexes of titanium and zirconium (CH3)2Si((η5−C5H3CH2CH2CN)(C5H5)MCl2)2 (M=Ti(1), Zr(2)) were synthesized and developed for the polymerization of ethylene. Compared with their corresponding mononuclear complexes (η5−C5H4CH2CH2CN)(C5H5)MCl2 (M=Ti(3), Zr(4)), the dinuclear complexes had higher catalytic activity. And the polyethylene produced had a higher molecular weight than that obtained K7with mononuclear catalysts. Effects of conditions on the ethylene polymerization catalyzed by (2)/MAO (methylaluminoxane) were studied in detail. The catalyst showed a very high activity (>106 g PE/mol Zr·h) under low catalyst concentration and high molar ratio of Al/Zr.

Key words： Homo-dinuclear catalyst      Titanocene      Zirconocene      Polyethylene      Chemical engineering     
Received: 18 October 2001     
CLC:  O632.12  
  TQ032.4  
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SUN Jun-quan
LIANG Cheng-feng
YANG Yong-rong
Schumann H.
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SUN Jun-quan, LIANG Cheng-feng, YANG Yong-rong, Schumann H.. Ethylene polymerization with novel silicon bridged homo-dinuclear cyanoethyl cyclopentadienyl complexes of titanium and zirconium. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2002, 3(2): 148-150.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2002.0148     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2002/V3/I2/148

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