Abstract In this work, poly(lactide-e-caprolactone) copolymer grafted lignin nanoparticles (LNP-g-P(LA-CL) were synthesized, through a ring-open polymerization (ROP) of L-lactide and e-caprolactone, initiated from the hydroxyl groups on LNP surface. Then PLA, PCL and various amounts of the copolymer were blended via a facile solvent casting approach. Mechanical tests showed that the addition of 6 wt% LNP-g-P(LA-CL) copolymer made a significant contribution to the toughness of PLA/PCL blend, which was enhanced by 4 folds in comparison with neat PLA. Meanwhile, the crystallization ability of both PLA and PCL were improved due to the better interfacial adhesion and mobility of PLA and PCL chains. Well-distributed elongated-fibrils and crazes, observed after tensile measurements for the nanocomposites, were responsible for absorbed energy, improved toughness and flexibility of PLA. Furthermore, UV–Vis spectroscopy measurements showed that the incorporation of 12 wt% of LNP-g-P(LA-CL) copolymer make PLA/PCL film able to shield almost 100 wt% of UV-B and UV-C irradiation. PLA/PCL-LNP nanocomposites can be used as impact resistance materials and in UV-resistance fields, such as sunshade and food packaging areas.

中文翻译：

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可生物降解的聚（乳酸）-聚（ε-己内酯）-纳米木质素复合薄膜具有优异的柔韧性和紫外线阻隔性能

提高PLA的韧性和柔韧性。此外，UV-Vis 光谱测量表明，加入 12 wt% 的 LNP-gP(LA-CL) 共聚物使 PLA/PCL 薄膜能够屏蔽几乎 100 wt% 的 UV-B 和 UV-C 辐射。PLA/PCL-LNP纳米复合材料可用作抗冲击材料和抗紫外线领域，如遮阳和食品包装领域。