【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。更多还原

【Abstract】 Morphology of crystalline polyethylene (PE) irradiated under "Co 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 relexaiion parameters of, Tx 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.更多还原