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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2005, Vol. 6 Issue (10): 9-    DOI: 10.1631/jzus.2005.B1009
    
Strong influences of polymerization temperature on ethylene/1-hexene copolymerization catalyzed by (2-PhInd)2ZrCl2/methyl aluminoxane
YE Jian-ding, FAN Zhi-qiang, WANG Wei
Institute of Polymer Science, Zhejiang University, Hangzhou 310027, China
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Abstract  Ethylene/1-hexene was copolymerized by an unbridged zirconocene, (2-PhInd)2ZrCl2/MAO (methyl aluminoxane) at 0 °C and 50 °C respectively. High copolymerization activity and 1-hexene incorporation were observed at 0 °C, with the copolymer formed having random sequence distribution and narrow molecular weight distribution. Ethylene polymerization at 50 °C showed high activity, but copolymerization at 50 °C showed much lower activity, which decreased sharply with increasing 1-hexene concentration in the monomer feed. Copolymer formed at 50 °C showed blocky sequence distribution and broad molecular weight distribution. A mechanism model based on ligand rotation hindered by the propagation chain has been proposed to qualitatively explain the observed phenomena.

Key words： Unbridged metallocene      Ethylene      1-Hexene      Copolymerization      Temperature effect     
Received: 27 July 2005     
CLC:  O63  
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YE Jian-ding
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WANG Wei
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YE Jian-ding, FAN Zhi-qiang, WANG Wei. Strong influences of polymerization temperature on ethylene/1-hexene copolymerization catalyzed by (2-PhInd)2ZrCl2/methyl aluminoxane. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6(10): 9-.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2005.B1009     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2005/V6/I10/9

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