高等学校化学学报

高等学校化学学报

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双吡唑亚胺镍/甲基铝氧烷催化降冰片烯的聚合

王媛媛, 祝方明, 林尚安   

  1. 中山大学化学与化学工程学院高分子科学研究所, 广州 510275
  • 收稿日期:2007-12-13 修回日期:1900-01-01 出版日期:2008-08-10 发布日期:2008-08-10
  • 通讯作者: 林尚安

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

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被引次数

14

摘要： 合成了两种双吡唑亚胺镍配合物: 双-N-(苯基-1-3,5-二甲基吡唑基亚甲基)苯基亚胺二溴化镍(Cat.1)和双-4-甲氧基-N-(苯基-1-3,5-二甲基吡唑基亚甲基)苯基亚胺二溴化镍(Cat.2). 研究了Cat.1/MAO和Cat.2/MAO催化体系对降冰片烯(NBE)单体聚合的催化性能, 考察了各种聚合条件, 如温度、Al/Ni摩尔比及催化剂浓度对降冰片烯的催化效率、单体转化率、聚合物分子量及分子量分布的影响. 研究结果表明, Cat.1/MAO和Cat.2/MAO催化体系对降冰片烯聚合具有较高的催化效率, 可达到105 g PNBE/(mol Ni)数量级, 所得聚降冰片烯(PNBE)的重均分子量在105以上, 分子量分布指数在2左右. 聚合产物的1H NMR和FTIR谱分析结果表明, 该聚合反应是以单体的乙烯基加成聚合机理进行的.

关键词: 双吡唑亚胺镍配合物, 聚降冰片烯聚合, 乙烯基加成聚合

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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