波谱学杂志 ›› 1990, Vol. 7 ›› Issue (1): 81-86.

• 研究论文 • 上一篇    下一篇

镁钛系载体催化剂乙丙共聚的ESR研究

詹瑞云, 李三喜, 庞德仁, 黄葆同   

  1. 中科院长春应用化学研究所
  • 收稿日期:1989-01-30 修回日期:1989-06-12 出版日期:1990-03-05 发布日期:2018-01-23

ESR STUDIES OF HIGH ACTIVITY TITANIUM-MAGNESIUM CATALYST FOR ETHYLENE AND PROPYLENE COPOLYMERIZATION

Zhan Ruiyun, Li Sanxi, Pang Deren, Huang Baotong   

  1. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1989-01-30 Revised:1989-06-12 Online:1990-03-05 Published:2018-01-23

摘要: 本文用ESR研究MgCL2-n-BuOH-i-Bu3Al-TiCl4/i-Bu3Al催化剂乙丙共聚机理。ESR谱表明烷基化Ti3+活性中心有单空配位和双空配位两种状态,在乙烯或乙丙烯混和单体存在下ESR谱变化指出g=1.954和g=1.941的共振吸收峰和活性中心有关。结合共聚产物组成及竞聚率的13C-NMR谱分析,提出镁钛系载体催化剂活性中心上乙丙同时配位的机理。

关键词: ESR, 13C-NMR, Ziegler-Natta催化剂, 乙丙共聚, 镁钛催化剂

Abstract: ESR method has been used to study the active center states of high yield MgCl2-n-BuOH-i-Bu3Al-TiCl4 catalyst for ethylene and propylene copolymerization. It has been shown that two kinds of coordination states with one and two vacant sites would exist in the alkylated Ti3+ ions. The variation of ESR spectra of the catalysts in the presence of ethylene or ethylene and propylene mixture gases show that the ESR signals with g=1.954 and g=1.941 were associated with active centers of Ti3+. Combining with the 13C NMR studies on the composition of copolymerization products and the reactivity ratios, a mechanism for ethylene and propylene simultaneous coordination with active centers of Ti3+ in the catalyst has been proposed.

Key words: ESR, 13C-NMR, Ethvlcne and propylcnc copolymcrization, Ti-Mg catalvst, Zicaler-Natta catalvst