波谱学杂志2011，Vol.28Issue(4)：447-453,7.
辐射引发和热引发聚丙烯腈纤维的自由基研究
Radiation-and Thermal Treatment-Induced Radicals in Polyacrylonitrile Fibers Studied by ESR
摘要
Abstract
The free radicals in polyacrylonitrile (PAN) fibers induced by γ-ray irradiation and thermal treatment were studied using electron spin resonance (ESR) technique. The radicals produced by radiation in air and vacuum at room temperature were assigned primarily to alkyl (H abstraction from methine) and polyimine radicals. These radicals were found stable at room temperature, but decayed with increasing temperature in air until 150 ℃. A new type of radical was formed in original PAN fibers at .190 ℃ in air, and the concentration of the radical increased significantly with temperature. Much less radicals were formed if the PAN fibers were heated in vacuum. It could be speculated that the new type of radical observed was related to thermal-oxidation reactions. This type of radical was attributed to a polyenyl radical located on the conjugated structure, and the conjugation length increased with temperature.关键词
电子自旋共振(ESR)/自由基/PAN纤维/辐照/热氧化Key words
ESR/ free radical/ PAN fiber/ radiation/ thermal-oxidation分类
化学化工引用本文复制引用
刘伟华,王谋华,吴国忠..辐射引发和热引发聚丙烯腈纤维的自由基研究[J].波谱学杂志,2011,28(4):447-453,7.基金项目
中国科学院知识创新工程重要方向性资助项目(KJCX2-YW-N33). （KJCX2-YW-N33）
