波谱学杂志 ›› 1990, Vol. 7 ›› Issue (1): 33-42.

• 研究论文 • 上一篇    下一篇

固体高分辨13C NMR研究γ线辐照对结晶聚乙稀聚集态结构的影响

朱清仁, 堀井文敬, 北丸竜三   

  1. 中国科技大学结构中心, 合肥
  • 收稿日期:1988-10-24 修回日期:1989-02-15 出版日期:1990-03-05 发布日期:2018-01-23

EFFECT OF γ-RAY ON MORPHOLOGY OF CRYSTALLINE POLYETHYLENE BY HIGH-RESOLUTION SOLID-STATE 13C NMR

Zhu Qingren, Horii Fumitaka, Kitamaru Ryozo   

  1. 1. Structural Center University of Science and Technology of China, Hefei;
    2. Institute for Chemical Research Kyoto University, Uji, Kyoto 611, Japan
  • Received:1988-10-24 Revised:1989-02-15 Online:1990-03-05 Published:2018-01-23

摘要: 结晶聚乙烯(PE)经60Coγ线辐照后,用固体高分辨13C NMR CP/DD MAS方法观测解析了辐射效果与具有片晶结构的结晶相,结晶-橡胶状无定形界面相以及橡胶状无定形相的聚集态结构的关系。考察了各相中的13C核自旋-晶格弛豫和自旋-自旋弛豫行为及辐照对其影响。得到辐照后产生交联,破坏,相转变及晶型变化等有意义的结果,对PE的辐照效应和机制的探讨提供了核磁共振的新实验证据。

关键词: 固体高分辨13CNMR, 魔角旋转, 交叉极化, 聚乙烯辐射效果, 界面相

Abstract: Morphology of crystalline polyethylene (PE) irradiated under 60Co γ-ray has been investigated by the high-resolution solid-state 13C NMR. It is revealed that crystalline phases with lamella, rubbery amorphous phase and their interphase in PE behaved differently to the radiation in the dose range of 75-520 Mrad. The relexation parameters of T2C and line width were determined for different phases. Their relationship with the radiation is discussed. The phenomena of cross-linking, damage, phase transition and transition of crystal mode in different phases of PE after radiation has been observed, which offer a new proof about mechanism and effect of radiation on PE by the 13C NMR.

Key words: High-resolution solid-state 13C NMR, Magic-angle sample spinning, Cross-polarization, Radiation effect on crystalline PE, Interphase