Effect of Dihydromyricetin on the Stability of Polypropylene in Natural Weathering Tests

摘要

Effects of dihydromyricetin (DMY), extracted from Ampelopsis grossedentata, on the antioxidantive properties of polypropylene were evaluated by investigating differences in mechanical properties and melt flowability between pre- and post-natural weathering tests. For comparison purposes, the effects of a synthetic phenolic commercial antioxidant (Irganox 1010) were also analyzed. The results showed that reduction in mechanical properties and increment in melt flowability of polypropylene containing DMY were slower than that of unstabilized reference during the aging process, which implies that DMY exhibits high efficiency as a thermal antioxidant for polypropylene. On the other hand, samples that contained Irganox 1010 obtained further improved stability over the samples containing DMY during 105days; however, the effectiveness of DMY lasted longer than that of Irganox 1010. DMY has a characteristic of being harmless and having high activity, good stability, and abundant resources to be a good natural antioxidant.