高能射线辐照会导致电容器储能介质发生交联和降解等化学变化，进而影响到电容器的宏观电气性能和应用性能。该文以双向拉伸聚丙烯(biaxially oriented polypropylene，BOPP)薄膜典型的串晶结构(shish-kebab)为对象，研究了γ辐照积累剂量 D 对分子链结构和结晶特性的影响，建立了辐照劣化模型。研究结果表明，当D<10 kGy时，辐照交联和降解反应同时发生且程度相当，结晶度和大分子含量均无明显变化;当D≥10 kGy时，辐照降解反应占主导，shish晶逐渐被破坏，结晶度和大分子含量逐渐下降;当D=1 000 kGy时，shish-kebab结构几乎完全破坏，薄膜内主要为片晶和无定形结构。该模型描述了γ辐照下shish-kebab结构的劣化过程，为聚合物晶体结构的辐照老化机理研究提供参考。
Irradiation Degradation Model of Shish-kebab Structure of Biaxially Oriented Polypropylene Film
High-energy radiation can lead to chemical changes such as cross-linking and degradation of energy storage dielectric of capacitors,which will affect the electrical performance and application of the capacitor.Taking the typical shish-kebab structure of biaxially oriented polypropylene(BOPP)film as the object,the effects of accumulated γ irradiation dose D on the molecular chain structure and crystallization characteristics are studied,and the irradiation degradation model is established.The results show that when D<10 kGy,irradiation crosslinking and degradation reactions occur simultaneously to the same extent,and the crystallinity and the content of molecules with high molecular weight do not change significantly.When D≥10 kGy,the irradiation degradation reaction is dominant,the shish structure is gradually destroyed,and the crystallinity and the content of molecules with high molecular weight decrease gradually.When D=1 000 kGy,the shish-kebab structure is almost completely destroyed,and there is mainly lamellar and amorphous region in the film.The model describes the degradation process of shish-kebab structure when applying γ irradiation,providing a reference for the irradiation aging mechanism of polymer crystal structure.
γ irradiationbiaxially oriented polypropylene(BOPP)filmshish-kebab structurecrystallinitydegradation model
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