As one of the most important biobased and biodegradable polymers with a promising commercial prospect, polylactic acid (PLA) has gained increasing interest. Nevertheless, its high mechanical strength is generally sacrificed when using tough matters to overcome its inherent brittleness. Concerning to develop strong and tough PLA-based materials, herein, polybutylene succinate (PBS) is blended with PLA, and epoxidized microfibrillated cellulose (MFC-EPI) is employed as an interfacial compatibilizer as well as a reinforcement filler. Effects of the amounts of PBS and MFC-EPI on crystallization behavior, thermal stability, and mechanical properties of the PLA-based materials are investigated. Notably, tensile strength and elongation at break of the resultant composite containing 2% MFC-EPI are up to 71.4 MPa and 273.6%, respectively. The “bridge” effect of the filler contributes to energy transfer and dissipation during deformation, accounting for the toughening mechanism that is confirmed by microscopy. Such a “two-in-one” modification strategy ensures the high strength and toughness, which can be used to develop more materials with high mechanical performances.

中文翻译：

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同时增强和微纤化纤维素的界面相容性，实现强韧的聚乳酸基复合材料

作为最重要的具有发展前景的生物基可生物降解聚合物之一，聚乳酸（PLA）引起了越来越多的兴趣。然而，当使用坚硬的物质克服其固有的脆性时，通常会牺牲其高机械强度。关于开发强韧的基于PLA的材料，在本文中，将聚丁二酸丁二酯（PBS）与PLA共混，并且将环氧化的微纤化纤维素（MFC-EPI）用作界面增容剂以及增强填料。研究了PBS和MFC-EPI的量对PLA基材料的结晶行为，热稳定性和机械性能的影响。值得注意的是，所得的包含2％MFC-EPI的复合材料的拉伸强度和断裂伸长率分别高达71.4MPa和273.6％。填充剂的“桥接”效应有助于变形过程中的能量转移和耗散，这说明了通过显微镜确认的增韧机理。这种“二合一”改性策略确保了高强度和韧性，可用于开发更多具有高机械性能的材料。