Citation: Yi Wang, Hong Fan, Su-yun Jie, Bo-geng Li. Ethylene Polymerization with Novel Phenoxy-imine Catalysts Bearing 4-Vinylphenyl Group[J]. Chinese Journal of Polymer Science, ;2014, 32(7): 854-863. doi: 10.1007/s10118-014-1470-5 shu

Ethylene Polymerization with Novel Phenoxy-imine Catalysts Bearing 4-Vinylphenyl Group

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

Corresponding author: Hong Fan,
Received Date: 29 September 2013
Revised Date: 11 February 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 20936006 and 20976152) and National Basic Research Program of China (2011CB606001). And Doctoral Program of Higher Education of China (No. 20100101110041) and Program for Changjiang Scholars and Innovative Research Team in Zhejiang University.

This contribution reports ethylene polymerization behavior of titanium complexes incorporating bis(phenoxy-imine) ligands. Six phenoxy-imine Ti(IV) complexes {6-R1-2-[CH＝N(2,6-difluoro-3,5-diR2-4-R3Ph)]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, multi-modal 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 ℃, less than 20 min). Otherwise, the moderate to high ethylene polymerization activity of ca. 105-106 g PE/(mol Tih) and high molecular weight (Mw = 105-106) of polyethylene can be obtained by changing the skeleton structure of these complexes.
- Ethylene polymerization,
- Catalytic heterogeneity,
- Living polymerization,
- Phenoxy-imine ligand,
- 4-Vinylphenyl group
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