Ethylene polymerization with novel phenoxy-imine catalysts bearing 4-vinylphenyl group

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• 作者：Yi Wang (1)
  Hong Fan (1)
  Su-yun Jie (1)
  Bo-geng Li (1)
  
• 关键词：Ethylene polymerization ; Catalytic heterogeneity ; “Living-polymerization ; Phenoxy ; imine ligand ; 4 ; Vinylphenyl group
• 刊名：Chinese Journal of Polymer Science
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：32
• 期：7
• 页码：854-863
• 全文大小：
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• 作者单位：Yi Wang (1)
  Hong Fan (1)
  Su-yun Jie (1)
  Bo-geng Li (1)
  
  1. Department of Chemical and Biological Engineering, State Key Laboratory of Chemical Engineering, Zhejiang University, Hangzhou, 310027, China
  
• ISSN：1439-6203

文摘

This contribution reports ethylene polymerization behavior of titanium complexes incorporating bis(phenoxyimine) ligands. Six phenoxy-imine Ti(IV) complexes {6-R 1 -2-[CH=N(2,6-difluoro-3,5-diR 2 -4-R 3 Ph)]C6H3O}2TiCl2 (1: R1 = H, R2 = H, R3 = H; 2: R1 = H, R2 = H, R3 = 4-vinylphenyl; 3: R1 = CH3, R2 = H, R3 = H; 4: R1 = CH3, R2 = H, R3 = 4-vinylphenyl; 5: R1 = CH3, R2 = F, R3 = H; 6: R1 = CH3, R2 = F, R3 = 4-vinylphenyl) have been synthesized and evaluated for ethylene polymerization using dried MAO (simplified as DMAO) as cocatalyst. An obvious catalytic heterogeneity of Cat 2 (Complex 2/DMAO) towards ethylene polymerization was observed, which was illustrated by decreased activity, multimodal molecular weight distribution and partially improved particle morphology comparing with Cat 1. Moreover, Cat 3 exhibits “living-characteristics in the process under certain conditions (25 °C, less than 20 min). Otherwise, the moderate to high ethylene polymerization activity of ca. 105-06 g PE/(mol Ti·h) and high molecular weight (M w = 105-06) of polyethylene can be obtained by changing the skeleton structure of these complexes.