Abstract This paper describes the separation of oxidation resistant components from the seeds of pomegranate (PSA), grape (GSE) and sea buckthorn (SSE). The anti-oxidation properties of the resultant extracts, used as the natural anti-oxidants for polypropylene (PP), were compared with Irganox1010. The effects of these natural antioxidants on the antioxidant levels of PP samples were estimated by thermal oxidative aging and micromixed rheology, OIT, XRD, SEM, TEM and mechanical properties tests of samples before and after aging. The results show that adding PSA, GSE and SSE can obviously increase the mechanical properties of PP. In addition, the molding stability of polypropylene raw material is prolonged and improved. Moreover, the mechanical properties of the PP samples after 240 h of thermal oxidative aging indicates that, the best results, closest to the anti-oxidation ability of Irganox1010, can be obtained when the additive amount is 0.5% (wt%) for PSE or 0.7% (wt%) for GSE.

中文翻译：

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天然抗氧化剂体系对聚丙烯抗氧化性和机械性能的影响

摘要 本文描述了从石榴 (PSA)、葡萄 (GSE) 和沙棘 (SSE) 种子中分离抗氧化成分的方法。将所得提取物用作聚丙烯 (PP) 的天然抗氧化剂的抗氧化性能与 Irganox1010 进行了比较。通过热氧化老化和微混合流变学、OIT、XRD、SEM、TEM和老化前后样品的力学性能测试来评估这些天然抗氧化剂对PP样品抗氧化水平的影响。结果表明，加入PSA、GSE和SSE能明显提高PP的力学性能。此外，聚丙烯原料的成型稳定性得到延长和提高。此外，热氧化老化 240 小时后 PP 样品的机械性能表明，最好的结果是，