高等学校化学学报

高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (2): 193.

• 研究论文 • 上一篇    下一篇

含稀土的钛系催化剂进行乙烯聚合动力学及ZnCl2调节分子量的研究

赵振河, 周新华, 卢泽俭, 陆耘, 林尚安   

  1. 中山大学高分子科学研究所
  • 收稿日期:1988-05-06 出版日期:1990-02-24 发布日期:1990-02-24
  • 通讯作者: 林尚安

Kinetics of Ethylene Polymerization and Regulation of Molecular Weight with ZnCl2

Zhao Zhenhe, Zhou Xinhua, Lu Zejian, Lu Yun, Lin Shangan   

  1. Institute of Polymer Science, Zhongshan University, Guangzhou
  • Received:1988-05-06 Online:1990-02-24 Published:1990-02-24

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摘要： 以SN-1催化剂进行乙烯常压聚合动力学研究表明,催化剂高效的主要原因是活性中心浓度明显增大、表观活化能△E较低。研究了ZnCl2对乙烯聚合反应的影响。发现ZnCl2能有效地降低聚乙烯的分子量,并能显著地提高催化效率,当ZnCl2浓度过大时,则对聚合反应有抑制作用。

关键词: 乙烯聚合, 动力学, 氯化锌

Abstract: The kinetics of the polymerization of ethylene has been studied at normal pressure with the highly active catalyst system TiCl4,NdCl3/MgCl2/Al(C2H5)3. The rate of polymerization VP,the specific number of active centers [C*] , the propagation rate constant kP,the activation energy ΔE and the lifetime of growing chain Lwere obtained by a kinetics method for the polymerization of ethylene. The influence of ZnCl2 on the polymerization of ethylene has been investigated. It has been found that ZnCl2 is a considerably effective transfer agent. Not only it decreases the molecular weight of polyethylene, but raises the catalytic efficiency notably as well. However, at a higher ZnCl2 concentration, the rate of polymerization was decreased.

Key words: Ethylene polymerization, Kinetics, Zinc chloride

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