高等学校化学学报

高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (4): 642.

• 论文 • 上一篇    下一篇

以TiCl4为共引发剂的阳离子聚合体系的络合竞争

郭文莉1, 李树新1, 马育红2, 徐瑞清2, 武冠英2   

  1. 1. 北京石油化工学院化工系, 北京, 102600;
    2. 北京化工大学高分子材料研究所, 北京, 100029
  • 收稿日期:1996-11-22 出版日期:1998-04-24 发布日期:1998-04-24
  • 通讯作者: 郭文莉,女,35岁,硕士,副教授.
  • 作者简介:郭文莉,女,35岁,硕士,副教授.
  • 基金资助:

    国家自然科学基金

Complexation Competition in Cationic Polymerization with TiCl4 Coinitiator

GUO Wen-Li1, LI Shu-Xin1, MA Yu-Hong2, XU Rui-Qing2, WU Guan-Ying2   

  1. 1. Chemical Engineering Department, Beijing Institute of Petrochemical Technology, Beijing, 102600;
    2. Research Institute of Polymer Materials, Beijing University of Chemical Technology, Beijing, 100029
  • Received:1996-11-22 Online:1998-04-24 Published:1998-04-24

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摘要： 通过聚合物的GPC谱图分析以及紫外光谱测试证明了以TiCl4为共引发剂的阳离子聚合体系中微量水与引发剂和TiCl4之间存在着络合竞争,提出了抑制水对阳离子聚合影响的方法.

关键词: 阳离子聚合, 紫外光谱, 络合竞争

Abstract: The tert-butyl acetate/TiCl4/IB/CH2Cl2, Cl2/TiCl4/IBVE/C6H5CH3, n butyl propenylate/TiCl4/IB/ CH2Cl2 cationic polymerization systems were studied. Summarizing and comparing results of the GPCtraces and the characteristic absorption bands of UVand FTIRspectra respectively, one can conclude: (1) The GPCtraces of polymer changed in line with increase of initiator concentration from unimodal with comparatively high Mw to bimodal showing both high and low Mw fraction. The former unimodal traces are corresponded to single active center[TiCl4←H2O] and the later bimodal traces are corresponded to two active centers comprising both [TiCl4←initiator] and [TiCl4←H2O]. (2) The different properties of polymers obtained by different sequences of chemicals addition and ageing procedure were due to complexation competition and equilibrium which usually required a certain period of time. (3) There are at least two sorts of initiating species in equilibrum.

Key words: Cationic polymerization, UV spectroscopy, Complexing competition

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