应用化学 ›› 1994, Vol. 0 ›› Issue (3): 104-106.

• 研究论文 • 上一篇    下一篇

一种对异戊二烯立体控制聚合较敏感的稀土催化体系

李凤富, 金鹰泰, 裴奉奎, 王佛松, 孙玉芳   

  1. 中国科学院长春应用化学研究所 长春 130022
  • 收稿日期:1993-08-16 修回日期:1993-12-25 出版日期:1994-06-10 发布日期:1994-06-10
  • 基金资助:
    国家自然科学基金联合资助项目

A Rare Earth Catalyst susceptible to Sterecocontrol of Isoprene Polymerization

Li Fengfu, Jin Yingtai, Pei Fengkui, Wang Fosong, Sun Yufang   

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • Received:1993-08-16 Revised:1993-12-25 Published:1994-06-10 Online:1994-06-10

摘要: 发现了一种对异戊二烯聚合立体选择性较敏感的稀士催化体系:(β-CH3-allyl)2LnCl5Mg·2TMED(Ln)-R3Al(Al)(Ln=Nd、Ce和La,T的ED:N,N,N′,N′-四甲基乙二胺;R=Me-,Et-,i-Bu-和Oct-).该催化体系在改变聚合温度、聚合时间、Al/Ln摩尔比、溶剂等时,可使聚异戊二烯的立体现整度有较大的改变,其中顺式-1,4、反式-1,4和3,4-链节含量的变化范围分别为19%~79%、17%~78%和0%~3.5%,还可获得较低分子量的聚合物。

关键词: 异戊二烯聚合, 稀土催化剂, 立体选择性

Abstract: A new rare earth catalyst system was found.It is composed of(β-CH3-allyl)2LnCl5Mg·2TMED(Ln)-R3Al(Al)(Ln=Nd、Ce and La,T的ED:N,N,N′,N′-tetramethyl-ethylendiamine;R=Me-,Et-,i-Bu- and Oct-)for stereocontrol of isoprene polymerization. The catalyst was capable of carying stereoregularity of polyisoprene(PIP)in the wider range by changing the polymerization temperature,polymerization time,Al/Ln molar ratio, and solvent and giving lower molectilar weight polymers. The contents of cis-1, 4-,trans-1,4-,and 3,4-unit in PIPs ranged from 19% to 79%,17% to 78% and 0 to 3.5%,respectively.

Key words: isoprene polymerization, π-allyl rare earth catalyst, stereocontrol