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Citation: WANG Jiabao, MU Hongliang, LI Yuesheng. Vanadium Complexes Containing Pyridylimine(amine) Ancillary Ligands for Olefin Polymerization[J]. Chinese Journal of Applied Chemistry, ;2015, 32(5): 510-518. doi: 10.11944/j.issn.1000-0518.2015.05.140315 shu

Vanadium Complexes Containing Pyridylimine(amine) Ancillary Ligands for Olefin Polymerization

1.
a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
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b Graduate School of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: MU Hongliang,
Received Date: 12 September 2014
Available Online: 9 January 2015
Fund Project: Supported by the National Natural Science Foundation of China(No.21234006) (No.21234006)

A series of vanadium(Ⅲ) complexes 2a~2e bearing pyridyldiimine,pyridyl-imineamine and pyridyldiamine ligands was designed,synthesized,and characterized by IR and elemental analysis.Upon treatment with Et2 AlC l and CCl3COOEt(ETA),these catalysts displayed high catalytic activity towards ethylene polymerization even at elevated reaction temperature,affording polymers with high relative molecular mass and unimodal relative molecular mass distributions,indicating the formation of a single active site during the polymerization.It was found that ligands structures exerted great influence on the polymerization behavior.Complex 2e (2,6-bis[2,6-(ⁱPr)₂PhNC(Me)]₂(C₅H₃N)VCl) supported by dianionic pyridyldiamine showed an activity of 6.96 kg PE/(mmol_V·h) at 50℃ and the activity was well kept at the elevated temperature(70℃).Efficient copolymerization of ethylene with NBE or 1-hexene was also observed.Poly(ethylene-co-NBE) with the NBE content up to 37.7% was obtained by complex 2e under mild condition,and the incorporation of 4.8% 1-hexene was observed in poly(ethylene-co-1-hexene) by complex 2d.
- olefin polymerization,
- vanadium(Ⅲ) complexes,
- ethylene polymerization,
- copolymerization
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