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

doi:10.11944/j.issn.1000-0518.2015.05.140315

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (5): 510-518.DOI: 10.11944/j.issn.1000-0518.2015.05.140315

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

WANG Jiabao^{a, b}, MU Hongliang^{a, *}, LI Yuesheng^a

^aState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
^bGraduate School of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-09-12 Revised:2014-11-06 Accepted:2015-01-09 Published:2015-05-05 Online:2015-05-05
Contact: MU Hongliang
Supported by:
Supported by the National Natural Science Foundation of China(No.21234006)

Abstract

Abstract:

A series of vanadium(Ⅲ) complexes 2a2e bearing pyridyldiimine, pyridyl-imineamine and pyridyldiamine ligands was designed, synthesized, and characterized by IR and elemental analysis. Upon treatment with Et₂AlCl 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.

Key words: olefin polymerization, vanadium(Ⅲ) complexes, ethylene polymerization, copolymerization

CLC Number:

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.

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

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