波谱学杂志 ›› 2000, Vol. 17 ›› Issue (3): 217-222.

• 研究论文 • 上一篇    下一篇

快速电子辐照F-40残存自由基热衰减的ESR研究

邢大立1, 赵祥臻2, 王寿泰2   

  1. 1 东莞理工学院应用化学系, 东莞 523000;
    2 上海交通大学高分子材料研究所, 上海 200240
  • 收稿日期:2000-01-25 修回日期:2000-03-03 出版日期:2000-06-05 发布日期:2018-01-11
  • 作者简介:邢大立,男,1967年出生,硕士,讲师

ESR STUDY ON THERMAL DECAY OF RADICALS TRAPPED IN HIGH-SPEED ELECTRON IRRADIATED F-40

XING Dali1, ZHAO Xiangzhen2, WANG Shoutai2   

  1. 1 Dongguan Institute of Technology, Dongguan 523000;
    2 Polymeric Materials Research Institute of Shanghai Jiaotong University, Shanghai 200240
  • Received:2000-01-25 Revised:2000-03-03 Online:2000-06-05 Published:2018-01-11

摘要: 空气中辐照F-40样品中残存的链侧过氧自由基没有链端过氧自由基稳定.这些自由基的热衰减呈明显二级反应特征.反应表观活化能与指前因子这两个对反应速率常数起着相反影响的动力学参数之间存在着动力学补偿效应,表明自由基热衰减是同时在不同活性中心上进行的复杂反应.

关键词: 辐照F-40, 残存自由基, 热衰减动力学, 补偿效应, ESR

Abstract: The mid-chain peroxyl radicals trapped in the samples irradiated in air are less stable than the end-chain peroxyl radicals. It was indicated that thermal decays of the trapped radicals are second-order reactions. The compensation effects in kinetics exist between the apparent activation energy and the pre-exponent factor which effect reaction rate constants contrarily. Such phenomenon indicates that thermal decays of the trapped radicals are complex reactions which occur simultaneously at many active centres.

Key words: Irradiated F-40, Trapped radicals, Kinetics of thermal decay, Compensation effect, ESR