Poly (lactic acid) (PLA), as a biodegradable and biocompatible polymer, has attracted extensive attention and investigation in recent years. However, the inherent brittleness of PLA greatly limits its application. In this work, super toughed PLA-based blends were prepared by facile melt blending of PLA with poly (ethylene vinyl acetate) (EVA) and compatibilized by ethylene-methyl acylate-glycidyl methacrylate (E-MA-GMA), owing to the partial miscibility with EVA domains and the chemical reactions with PLA matrix of E-MA-GMA. Micromorphology reveals that E-MA-GMA effectively tunes the interface interactions and phase morphology of the incompatible PLA and EVA. Increasing the E-MA-GMA content promotes the phase adhesion and increases the interface thickness, thus producing a super-toughened blend behaving an incomplete fracture during impact tests. The maximum impact strength (about 77.6 kJ/m²) was obtained for the ternary blend with 12 wt% E-MA-GMA, which is 27.7 times higher than that of neat PLA. Rheological studies showed that the viscosity was enhanced for the ternary blends with large amounts of E-MA-GMA at low frequency. The PLA crystallinity was suppressed and the thermal stability was improved in the ternary blends. Micromechanical deformations and toughening mechanisms were studied, indicating that the matrix shear yielding, induced by the improved interface adhesion and the formed semi-continuous microstructure, was the main source for impact energy dissipation.

聚乳酸（PLA）作为一种可生物降解的生物相容性聚合物，近年来受到了广泛的关注和研究。然而，PLA固有的脆性极大地限制了其应用。在这项工作中，通过 PLA 与聚（乙烯醋酸乙烯酯）（EVA）的轻松熔融共混制备了超韧 PLA 基共混物，并通过乙烯-甲基丙烯酸酯-甲基丙烯酸缩水甘油酯（E-MA-GMA）增容，由于部分与 EVA 域的混溶性以及与 E-MA-GMA 的 PLA 基质的化学反应。微观形态表明，E-MA-GMA 有效地调整了不相容的 PLA 和 EVA 的界面相互作用和相形态。增加 E-MA-GMA 含量可促进相粘附并增加界面厚度，从而产生在冲击试验中表现出不完全断裂的超韧化混合物。² ) 是由含有 12 wt% E-MA-GMA 的三元共混物获得的，比纯 PLA 高 27.7 倍。流变学研究表明，在低频下，含有大量 E-MA-GMA 的三元共混物的粘度增加。三元共混物的 PLA 结晶度受到抑制，热稳定性得到改善。研究了微观机械变形和增韧机制，表明由改善的界面粘附和形成的半连续微观结构引起的基体剪切屈服是冲击能量耗散的主要来源。