Strong influences of polymerization temperature on ethylene/1-hexene copolymerization catalyzed by (2-PhInd)2ZrCl2/methyl aluminoxane |
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| Authors: | Ye Jian-ding Fan Zhi-qiang Wang Wei |
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| Institution: | (1) Institute of Polymer Science, Zhejiang University, 310027 Hangzhou, 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.
Project (Nos. 29734144 and 20274037) supported by the National Natural Science Foundation of China |
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| Keywords: | Unbridged metallocene Ethylene 1-Hexene Copolymerization Temperature effect |
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