中华医学超声杂志

应用化学 ›› 1995, Vol. 0 ›› Issue (1): 1-4.

• 研究论文 •    下一篇

多核Nd－Al双金属配合物对共轭双烯烃的聚合Ⅲ．溶剂等因素的影响

董为民, 杨继华, 逄束芬, 黄葆同   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1994-06-03 修回日期:1994-09-20 出版日期:1995-02-10 发布日期:1995-02-10
  • 基金资助:
    国家自然科学基金资助项目

Conjugated Diene Polymerization Catalyzed by Polynuclear Nd-Al Bimetallic ComplexⅢ.Influences of Solvent and Other Factors

Dong Weimin, Yang Jihua, Pang Shufen, Huang Baotong   

  1. Intstitute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • Received:1994-06-03 Revised:1994-09-20 Published:1995-02-10 Online:1995-02-10

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摘要： 报道了多核Nd-Al双金属配合物活性体对共轭双烯烃的溶液聚合.结果表明,适宜的振荡时间有利于提高活性体的催比活性;通过外加AlEt3,验证了聚合体系的纯度和活性体的稳定性,溶剂类型对活性体催比活性和聚合物分子量影响较大,活性次序为甲苯≥环己烷>正己烷;对产物[η]的影响则相反:甲苯《环己烷<正己烷.不同单体的定向聚合性能有差别,聚丁二烯的顺1,4含量较低,且易受反应条件的影响.

关键词: Nd－Al双金属配合物, 共轭双烯烃, 定向聚合, 溶剂

Abstract: Conjugated diene solution polymerization catalyzed by polynuclear Nd-Al bimetallic complex was further studied. Results indicate that the activity of the active species was imporved by appropriate shaking time. The purity of the polymerization system and the stability of the active species were examined by additional AIEt,. The type of solvent had obviously influence on the activity of the active species and the molecular weight of polymers obtained,the order of activity being toluene≥cyclohexane>:n-hexane,and conversely, the order of [η] being toluene <n-hexane. Difference monomers had different features of stereospecific polymerization;cis-1,4 microstructure content of polybutadiene was lower and varied more obviously with the experimental conditions than that of polyisoprene.The results aid in deepgoing understanding of the stereospecific polymerization initiated by rare earth catalyst.

Key words: Nd-Al bimetallic complex, conjugated diene, stereospecific polymerization, solvent

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