Chem. J. Chinese Universities

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Norbornene Polymerization Catalyzed by Bispyrazolylimineylimine Nickel(Ⅱ)/MAO Catalytic Systems

WANG Yuan-Yuan, ZHU Fang-Ming, LIN Shang-An*   

  1. Institute of Polymer Science, College of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2007-12-13 Revised:1900-01-01 Online:2008-08-10 Published:2008-08-10
  • Contact: LIN Shang-An

Abstract: Two bispyrazolylimine nickel complexes[bis-N-(phenyl-1,3,5-dimethylpyrazolylmethylene)phenylimine nickel dibromide] (Cat.1) and [bis-4-methoxy-N-(phenyl-1,3,5-dimethylpyrazolylmethylene) phenylimine nickel dibromide](Cat.2) were synthesized. Norbornene polymerization catalyzed by Cat.1/MAO and Cat.2/MAO systems was investigated. The catalytic efficiency, molecular weight and molecular weight distribution were influenced by the polymerization conditions, such as the polymerization temperature, Al/Ni molar ratio and catalyst concentration. The results show that Cat.1/MAO and Cat.2/MAO systems displayed a high catalytic efficiency with 105 g PNBE/(mol Ni) magnitude order. The molecular weights of PNBE were higher than 105 and the molecular weight distributions were around 2. According to 1H NMR and the FTIR spectra, the mechanism of the norbornene polymerization is vinyl-addition type polymerization.

Key words: Bispyrazolylimine nickel complexes, Nobornene polymerization, Vinyl-addition type polymerization

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