Abstract For many years, it has remained a hot topic to create a ductile polylactic acid (PLA) composite, especially by the modified lignin. Herein, we demonstrated a facile method for modified alkaline lignin (LMP) which was a toughener for PLA in the presence of polyethylene glycol 400 (PEG400). The mechanical tests showed that in addition to a high extensibility of 328.8%, as-designed PLA/PEG400/LMP ternary blend exhibited excellent toughness of 65.4 MJ·m−3 and high notched impact strength of 10.9 kJ·m−2, which were respectively 12 and 2 folds of those of neat PLA. Moreover, the toughening mechanism of LMP particles in PLA composites from the morphology study was demonstrated. More importantly, it was meaningful to turn industrial waste lignin into wealth.

中文翻译：

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用于韧性聚乳酸复合材料的改性碱性木质素

摘要 多年来，特别是通过改性木质素制备韧性聚乳酸（PLA）复合材料一直是一个热门话题。在此，我们展示了一种在聚乙二醇 400 (PEG400) 存在下改性碱性木质素 (LMP) 的简便方法，该方法是 PLA 的增韧剂。力学测试表明，除了 328.8% 的高延展性外，设计的 PLA/PEG400/LMP 三元共混物还表现出 65.4 MJ·m-3 的优异韧性和 10.9 kJ·m-2 的高缺口冲击强度分别是纯PLA的12倍和2倍。此外，通过形态研究证明了 PLA 复合材料中 LMP 颗粒的增韧机制。更重要的是，将工业废料木质素转化为财富意义重大。