Abstract The use of plasticizers, polymer blends and composites have been reported as effective strategies to overcome the rigidity and brittleness of PLA, drawbacks that commonly limits its application. In this study poly(lactic acid) was plasticized with 7 and 12 wt.% of dibutyl esters of maleic or fumaric acid. The choice of plasticizer was motivated by recent studies reporting the biodegradability of maleic and fumaric esters and their efficiency as green plasticizers. This current study evaluates how the chemical structure, specifically the cis-trans isomerism of the plasticizer, can affect the plasticizing properties on PLA. The thermal and mechanical properties of the plasticized specimens were evaluated by DSC, DMA, Stress-Strain and Relaxation tests. The results indicated that samples plasticized with dibutyl fumarate exhibited a lower glass transition temperature (Tg), lower Young’s modulus, and higher elongation at break than specimens plasticized with dibutyl maleate.

中文翻译：

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用马来酸二丁酯和富马酸二丁酯异构体增塑的聚乳酸的机械和热性能：作为可生物降解增塑剂的有希望的替代品

摘要 据报道，增塑剂、聚合物共混物和复合材料的使用是克服 PLA 刚性和脆性的有效策略，这些缺点通常限制了其应用。在这项研究中，聚乳酸用 7 和 12 重量％的马来酸或富马酸二丁酯增塑。选择增塑剂的动机是最近的研究报告了马来酸酯和富马酸酯的生物降解性及其作为绿色增塑剂的效率。目前的研究评估了化学结构，特别是增塑剂的顺反异构如何影响 PLA 的增塑性能。通过DSC、DMA、应力-应变和松弛试验评估增塑试样的热和机械性能。