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Influence of the viscoelastic regime onto the UV reactivity of poly(lactic acid)
European Polymer Journal ( IF 6 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.eurpolymj.2018.11.016
Adam A. Marek , Vincent Verney

Abstract The photochemical reactivity of poly(lactic acid) in the rubbery and molten state was determined by two methods: photoRheology and photoDSC. Significant changes in rheological behaviour of PLA were observed, depending on the viscoelastic regime. In the rubbery state, cold crystallization causes difficulties in oxygen diffusion resulting mainly in crosslinking reactions. In the molten state, the competition between crosslinking and degradation was observed due to hydroperoxides decomposition. In all cases UV irradiation intensifies the reactions. Using PhotoDSC we determined the effect of hydroperoxides on the PLA degradation process, and the difference in effectiveness of temperature and UV on hydroperoxides decomposition.

中文翻译:

粘弹性状态对聚乳酸紫外线反应性的影响

摘要 聚乳酸在橡胶态和熔融态的光化学反应性通过两种方法测定:光流变学和光DSC。观察到 PLA 流变行为的显着变化,这取决于粘弹性状态。在橡胶状态下,冷结晶导致氧扩散困难,主要导致交联反应。在熔融状态下,由于氢过氧化物分解,观察到交联和降解之间的竞争。在所有情况下,紫外线照射都会加剧反应。使用 PhotoDSC,我们确定了氢过氧化物对 PLA 降解过程的影响,以及温度和紫外线对氢过氧化物分解的有效性差异。
更新日期:2019-01-01
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