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自旋标记法研究PEG/PVP体系的链运动

金桂东1,谭莉1,陈士明1*,严小敏1,沈伊民1,平郑骅2,华峰君2   

  1. 1.复旦大学分析测试中心,上海  200433; 2.复旦大学高分子科学系,上海  200433
  • 收稿日期:2001-01-06 出版日期:2001-03-05 发布日期:2001-03-05
  • 作者简介:金桂东(1974-),男,硕士研究生.*通讯联系人
  • 基金资助:

    国家自然科学基金资助项目.

A STUDY OF THE CHAIN MOTION IN PEG/PVP SYSTEM BY SPIN LABEL ESR

JIN Gui-dong1, TAN Li1, CHEN Shi-ming1*,  YAN Xiao-min1, SHEN Yi-min1, PING Zheng-hua2, HUA Feng-jun2
  

  1. 1.Center of Analysis and Measurment, Fudan University, Shanghai 200433; 2.Macromolecular Science Department, Fudan University, Shanghai 200433
  • Received:2001-01-06 Online:2001-03-05 Published:2001-03-05
  • About author:*Correspondence author
  • Supported by:

    国家自然科学基金资助项目.

摘要:

用自旋标记方法将氮氧自由基连接在聚乙二醇分子末端,研究了聚乙二醇/聚乙烯吡咯烷酮合金体系的链段运动.测得了体系在不同温度时的ESR谱,混合体系的ESR谱图由快运动和慢运动两部分组成,且两组分相对比例随着温度变化发生变化,表明混合体系中氮氧自由基处于不同的环境中.根据谱图参数计算得体系中快运动部分的旋转相关时间τc在10-9~10-11s之间,并由2AZZ′获得了体系的T5mT. 结果表明由于体系中聚乙二醇和聚乙烯吡咯烷酮异种分子间的相互作用,体系中高分子链运动发生了变化.

关键词:

Abstract:

The spin label ESR was used to study the chain motion in the PEG/PVP blends under different temperatures. In the ESR spectrum, there were two components in the PEG/PVP blends, indicating the different environments in the blends, while there was only slow component in the low temperature and only fast component in high temperature in SLPEG. With the ESR spectrum parameter, the calculated correlation time of the fast component of the samples was between 10-9~10-11s and T5mT of all samples was obtained from the out splitting width. The results for the T5mT and the correlation time showed that there was interaction between different polymer chains in the blends.

Key words: ESR, Spin label, PEG, PVP, Polymer blend

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