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本文用力学性能、分子量、ESR、IR等测定方法,研究比较了大分子受阻胺PDS和小分子受阻胺Tinuvin-770对聚丙烯的光防护作用。结果表明,二者的光防护作用都是通过形成>NO·稳定自由基机理;并能有效地接枝在聚丙烯上,而PDS还具有“微交联“作用。光氧化监测表明,PDS较耐光分解,其光氧化防护中所产生的>NO·稳定自由基在整个老化过程中保持一定的浓度,加之大分子化改善了PDS的热稳定性,耐抽提性,相容性,因而使PDS具有较高的光防护效率。
In this paper, the mechanical properties, molecular weight, ESR, IR and other determination methods, the study compared the macromolecular hindered amine PDS and small molecule hindered amine Tinuvin-770 on the PP protective effect. The results showed that the photoprotective effects of both were through the formation of> NO stable free radical mechanism and grafting onto polypropylene effectively, while PDS also had the effect of “micro-crosslinking”. Photooxidation monitoring showed that PDS was more resistant to photodegradation and the> NO · stable free radicals generated during its photooxidation protection maintained a certain concentration throughout the aging process. In addition, the macromolecularization improved the thermal stability and the stripping resistance of PDS , Compatibility, thus making PDS has a higher light protection efficiency.