| High Efficieney Synthesis of Isotaetie Polypropylene and Linear Polyethylene Using a New C2-symmetrie Carbon-bridged Zireonoeene Catalyst |
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| 作者单位： | CHENG Zhengzai（Institute of United Chemical Reaction Engineering, College of Material and Chemical Engineering,Zhejiang University, Hangzhou,310027,China） ;
SUN Junquan（Institute of United Chemical Reaction Engineering, College of Material and Chemical Engineering,Zhejiang University, Hangzhou,310027,China） ;
NIE Yu jing（Institute of United Chemical Reaction Engineering, College of Material and Chemical Engineering,Zhejiang University, Hangzhou,310027,China） ;
MU Bin（State Key Laboratory of Elemento-Orangic Chemistry,Department of Chemistry, Nankai University, Tianjin,300071, China） ;
XU Shansheng（State Key Laboratory of Elemento-Orangic Chemistry,Department of Chemistry, Nankai University, Tianjin,300071, China） ;
WANG Baiquan（State Key Laboratory of Elemento-Orangic Chemistry,Department of Chemistry, Nankai University, Tianjin,300071, China） ; |
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| 基金项目： | Funded by the National Natural Science Foundation of China （20374043） and SINOPEC（X501025） |
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| 摘 要： | Ansa-Cyclohexyl-bis（4,5,6,7-tertrahydro-l-indenyl） zirconium dichloride （5） was used as catalyst for propylene and ethylene polymerization together with methyl aluminoxane （MAO） as the cocatalyst. Isotactic polypropylene （PP） was obtained with the highest activity of 6.37× 107g PP （molZr）^-1h^-1. The mesomeso （mmmmm） pentads sequence content of PP was determined by 13C NMR spectroscopy. The dependence of the microstructure on the reaction temperature and the AI/Zr molar ratio was examined and the catalytic activity of complex 5 was compared with that of the similar ansa-zirconocene 3. The high activity of the new zirconocene 5 for propylene isospectic polymerization at high temperature （60℃） is the result of its unique bridged-group structure. Complex 5/MAO displays also high catalytic activity of 0.46× 10^6 to 9.87× 10^6g PE（molZr）^-h^-in the homo-polymerization of ethylene, The visometric molecular weight of PE ranges from 0.97×10^4 to 11.16×10^4 g.mol^- under the given conditions.^13C NMR spectroscopy analysis proves the PE to be linear polyethylene （LPE）.
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| 关 键 词： | 丙烯 聚合作用 全同序列 聚丙烯 聚乙烯 |
| 收稿时间： | 2006-05-21 |
| 修稿时间： | 2007-04-14 |
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