应用化学 ›› 1992, Vol. 0 ›› Issue (3): 72-75.

• 研究简报 • 上一篇    下一篇

二元稀土催化体系引发的异戊二烯定向聚合

蔡小平1, 龚志1, 王佛松1, 朱行浩2   

  1. 1. 中国科学院长春应用化学研究所, 长春 130022;
    2. 吉林化工公司研究院, 长春
  • 收稿日期:1991-04-08 修回日期:1991-07-12 出版日期:1992-06-10 发布日期:1992-06-10
  • 基金资助:
    国家自然科学基金

STEREOSPECIFIC POLYMERIZATION OF ISOPRENE BY BINARY LANTHANIDE CATALYST

Cai Xiaoping1, Gong Zhi1, Wang Foshong1, Zhu Xinghao2   

  1. 1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022;
    2. Research Institute of Jilin Chemical Industry Corporation, Jilin
  • Received:1991-04-08 Revised:1991-07-12 Published:1992-06-10 Online:1992-06-10

摘要: 最早用于共轭双烯烃定向聚合的二元稀土催化体系是LnCl3-AIR3[1],它能引发丁二烯定、向聚合,但催化活性不高。后来,报道了聚合活性较高的氯化稀土催化剂[2,3],主要是在二元稀土催化体系中添加适量的醇类试剂。最近,又有新型烷氧基氯化稀土催化剂Nd(OR)3-nCln-AlEt3引发丁二烯聚合的报道[4],但活性不高。有关烷氧基氯化稀土体系催化异戊二烯聚合尚未见报道,我们合成了异丙氧基稀土氯化物同三乙基铝组成的二元稀土催化剂,研究了异戊二烯的聚合规律。

关键词: 异戊二烯, 稀土催化剂, 定向聚合

Abstract: Nd(OPri)Cl2 in combination with AlEt3 is a binary lanthanide catalyst of higher activity for the stereospecific polymerization of isoprene. In this paper, the catalytic activity, as well as the microstruture of the polyisoprene are investigated. The experimental results show that it is a highly effective c talyst for the polymerization of isoprene to produce high cis-1,4 polyisoprene. The catalytic activity and the inherent viscosity [η] of the polyisoprene depend greatly on the amount of catalyst, the molar ratio of Al/Nd as well as the polymerization temperature. The cis-1,4 content of the polyisoprenes obtained is over 93% (determined by IR spectra) and the cis-1,4 level depends slightly on the polymerization conditions.

Key words: isoprene, lanthanide catalyst, stereospecific polymerization