高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (3): 371.

• 论文 • 上一篇    下一篇

VO(OR)2Cl-Al(t-Bu)3催化丁二烯丙烯交替共聚机理的探讨

焦书科, 余鼎声   

  1. 北京化工学院
  • 收稿日期:1981-10-21 出版日期:1983-06-24 发布日期:1983-06-24

PROBING ABOUT THE MECHANISM OF ALTERNATING COPOLYMERIZATION OF BUTADIENE AND PROPYLENE BASED ON THE VO(OR)2Cl-Al(i-Bu)3 CATALYSTS

Jiao Shuke, Yu Dingsheng   

  1. Beijing Institute of Chemical Technology, Beijing
  • Received:1981-10-21 Online:1983-06-24 Published:1983-06-24

摘要: 本文用电位滴定测定了钒的价态,与共聚合活性数据对照,认为活性中心主要是V+3离子;用IR测定了Al—O—V、Al→O和V—Cl后,提出活性中心为带Al—Cl—V、Al—O—V桥的钒中心正八面体结构。结合log[η]对1og(D890/D970)的线型关系推断交替共聚物的端基为β-甲基乙烯基,在此基础上提出了可能的引发、增长和终止机理。

Abstract: In this work, the soluble Ziegler-type catalyst systems prepared from VO(OR)3 Cl-Al (i-Bu)3 for the alternating copolymerization of butadiene and propylene have been studied.The valence of the vanadium ion in the center of the V-A1 complex was measured by means of the potentiometric titration method. From comparing the data of potentiometric analysis with polymerization results, it was concluded that the active species is V+3 ion. After investigating the reaction process between the two components of catalyst, an octa-hadrel complex model for the active center was suggested. In addition, the mechanisms of initiation oriented propagation and termination of chain for this catalytic system have been probed.By analyzing the NMR and IR spectrum, it was demonstrated that the termination of chain takes place mostly at the end of propylene unit.

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