The effect of input doses of Co γ-radiation from 80 to 12,000 kGy on the thermophysical properties and thermal stability of samples of polypropylene granules and powder obtained by high temperature shear grinding of irradiated granules, as well as on the tensile strength properties of a plate made from irradiated granules and their corresponding powders, was studied. The thermophysical properties of the powder are determined by the changes introduced by radiation into the initial polymer granules. The effects of radiation in air (environments with oxygen) were studied. Grinding redistributes oxygen-containing functional groups from the surface layer of irradiated granules throughout the entire volume of the obtained powder leading to the destruction of polymer chains as there is a component due to thermal destruction of radiolyzed polymer chains. High-temperature shear grinding of irradiated granules has a significant effect on the product powder, reducing its thermal stability but increasing the tensile strength of plates pressed from it at low absorbed doses. The current work shows that radiation treatment coupled with high temperature shear grinding could be a method for modifying the properties of polymers so that polypropylene waste can be processed for other applications.

中文翻译：

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辐射后高温剪切研磨对聚丙烯热性能和力学性能的影响

80 至 12,000 kGy 的 Co γ 辐射输入剂量对经辐照颗粒高温剪切研磨获得的聚丙烯颗粒和粉末样品的热物理性能和热稳定性以及板材拉伸强度性能的影响研究了由辐照颗粒及其相应粉末制成的。粉末的热物理性质由辐射引入初始聚合物颗粒的变化决定。研究了空气（有氧环境）中辐射的影响。研磨将来自辐照颗粒表面层的含氧官能团重新分布到所获得粉末的整个体积中，导致聚合物链的破坏，因为存在由于辐射分解的聚合物链的热破坏而产生的成分。辐照颗粒的高温剪切研磨对产品粉末有显着影响，降低了其热稳定性，但在低吸收剂量下增加了由其压制的板的拉伸强度。目前的工作表明，辐射处理与高温剪切研磨相结合可能是一种改变聚合物性能的方法，从而可以将聚丙烯废料加工用于其他应用。