自旋标记法研究PEG/PVP体系的链运动  

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

作　　者：金桂东[1] 谭莉[1] 陈士明[1] 严小敏[1] 沈伊民 平郑骅[2] 华峰君[2] 

机构地区：[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

出　　处：《波谱学杂志》2001年第1期13-20,共8页Chinese Journal of Magnetic Resonance

基　　金：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 1 0 - 9～1 0 - 1 1 s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 .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\+\{-11\}s and T \-\{5mT\} of all samples was obtained from the out splitting width. The results for the T \-\{5mT\} and the correlation time showed that there was interaction between different polymer chains in the blends.

关 键 词：电子自旋共振 自旋标记 聚乙二醇 聚乙烯吡咯烷酮 高分子合金 PEG/PVP体系 链段运动 ESR谱 顺磁性 相容性 

分 类 号：O631.12[理学—高分子化学] O657.61[理学—化学]