波谱学杂志 ›› 2008, Vol. 25 ›› Issue (2): 265-272.

• 研究简报 • 上一篇    下一篇

氯化聚乙烯辐射效应的NMR研究

陈春丽;赵新;孙万赋;唐军   

  1. 新疆大学 理化测试中心,新疆 乌鲁木齐 830046
  • 收稿日期:2007-06-14 修回日期:2007-09-05 出版日期:2008-06-05 发布日期:2009-12-05
  • 通讯作者: 赵新

Irradiation Effects on Chlorinated Polyethylene Studied by NMR Spectroscopy

CHEN Chun-li;ZHAO Xin;SUN Wan-fu;TANG Jun   

  1. The Center of Analysis and Measurement Xinjiang University, Urumqi 830046, China
  • Received:2007-06-14 Revised:2007-09-05 Online:2008-06-05 Published:2009-12-05
  • Contact: Zhao Xin

摘要: 1H NMR,13C NMR谱,二维谱,FT-IR等方法研究了氯化聚乙烯(CPE)在室温下限量空气中经60Co γ射线辐照后的辐照效应. 结果表明CPE在辐照过程中以发生裂解反应为主,在裂解反应过程中伴随着HCl脱出,HCl的脱出量随着辐照剂量的增加而增加. 辐照后CPE样品的大分子结构发生相应变化,序列结构为CH2CHClCHClCH2CHCl,CH2CH2CHClCH2CH2,CHClCH2CHClCH2CH2,CHClCH2CHClCH2CHCl的单元数量减少,但没有形成新的序列结构类型,T1T2值给出了有关辐照前后分子运动变化的信息.

关键词: 核磁共振, CPE, 辐照效应, 氯含量, 分子运动

Abstract: Irradiation effects on chlorinated polyethylene (CPE) were studied by 1D and 2D NMR spectroscopy, measurements of proton spin-spin relaxation time (T2) and spin-lattice relaxation time (T1) and FT-IR. The results indicated that degradation reactions took place after CPE was irradiated by 60Co γ-rays. It was shown that HCl emitted during irradiation. The higher the absorbed doses was, the more HCl emitted. The quantity of some sequential structures (e.g., CH2CHClCHClCH2CHCl, CH2CH2CHClCH2CH2, CHClCH2CHClCH2CH2, and CHClCH2CHClCH2CHCl) of CPE were found reduced after irradiation, but there were no evidence indicating that new sequential structures were formed. The values of T1 and T2 also provided very important information about the segmental motion of the molecules.

Key words: NMR, CPE, irradiation effect, content of Cl, segmental motion