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通常,人们认为辐照对熔融结晶聚乙烯片晶的破坏是按片晶表面破坏机理进行的,即在辐照中片晶表面链折迭交联处首先被破坏,随着辐照剂量的增加破坏逐渐向片晶内部延伸,当辐照剂量足够大时,片晶全部被破坏为非晶态。根据X射线广角衍射和小角散射强度积分不变量的考察,我们提出了片晶的辐照破坏主要发生在内部即片晶内部破坏机理。为了进一步论证上述观点,我们用电子显微镜进行了直观的考证,并用部分结晶聚合物的一维电子密度相关函数进行了对比分析,进一步证明了片晶内部破坏机理的可靠性。
In general, it is thought that the damage to the molten crystalline polyethylene platelets by irradiation is based on the destruction mechanism of the platelet surface, that is, the surface cross-linked portion of the platelets in the irradiation is firstly destroyed, and as the radiation dose is increased Destruction is gradually extended to the interior of the lamellae. When the irradiation dose is large enough, the lamellae are all destroyed to an amorphous state. According to the investigation of X-ray wide-angle diffraction and integral invariant of small-angle scattering intensity, we propose that the radiation damage of the platelet mainly occurs in the interior, ie, the internal damage mechanism of the platelet. In order to further demonstrate the above point of view, we conducted an intuitive research using electron microscopy and compared the one-dimensional electron density correlation function of partially crystalline polymers to further confirm the reliability of the failure mechanism within the lamella.