In this work, the effects of thermo-oxidative aging on the microstructure and impact properties of polyethylene during the rotational molding process were studied. FTIR and Raman analysis showed that the degradation of polyethylene was responsible for the low-temperature impact strength (LT-IS) and the brittle fracture behavior of samples those subjected to prolonged heating time during rotational molding process. The DSC and polarizing microscope analysis showed that the degradation process was delayed by the addition of antioxidants. Through use and optimization of antioxidants, the thermo-oxidative aging of polyethylene can be modulated, a broader processing window can be achieved, and the products may exhibit better mechanical properties with a wider heating time range.

在这项工作中，研究了热氧化时效对滚塑过程中聚乙烯的微观结构和冲击性能的影响。FTIR和拉曼分析表明，聚乙烯的降解是造成低温冲击强度（LT-IS）和样品在滚塑过程中加热时间延长的脆性断裂行为的原因。DSC和偏光显微镜分析表明，添加抗氧化剂可延缓降解过程。通过使用和优化抗氧化剂，可以调节聚乙烯的热氧化老化，可以实现更宽的加工范围，并且产品可以在更宽的加热时间范围内展现出更好的机械性能。