Super-toughened polylactide/polybutylene succinate/polybutylene adipate terephthalate (PLA/PBS/PBAT) ternary blends can be prepared by reactive extrusion in the presence of peroxide. However, the high peroxide contents always lead to lowered biodegradability and decreased flowability of the prepared materials. In this study, a strategy to prepare such super-toughened PLA ternary blends with a small amount of peroxide, by simultaneous phase transition and interfacial compatibilization, was demonstrated. Firstly, based on thermodynamic predictions, a core-shell PBS/PBAT structure was successfully prepared that worked as a toughening agent for PLA. Secondly, the viscosity ratio between PLA and PBS/PBAT was adjusted via the introduction of a small amount of peroxide because of the different reactive priority between peroxide and the polymers. Via transferring the co-continuous PBS/PBAT to droplet structure with optimum size and improving the compatibility between PLA and core-shell PBAT-PBS, two different super-toughened PLA ternary blends with high impact strength and melt strength were successfully prepared. The resulting ternary blends showed super toughness with significantly improved notched impact strength (∼530 J/m). The mechanism behind the morphology transformation is discussed based on the phase inversion theory with the help of relaxation time spectrum analysis and atomic force microscopy (AFM). The studies show that both the morphology transition of the different components and improved compatibility make contributions together to the improved mechanical properties. The research provides a new approach to improving the toughness of the polymer blends in reaction extrusion by tailoring the viscosity ratios between different components. The ternary blends developed are expected to be used widely in industrial applications.

可以通过在过氧化物的存在下进行反应挤出来制备超增韧的聚丙交酯/聚丁二酸丁二酯/聚己二酸丁二酯（PLA / PBS / PBAT）三元共混物。然而，高的过氧化物含量总是导致所制备的材料的生物降解性降低和流动性降低。在这项研究中，表明了通过同时相变和界面相容化制备具有少量过氧化物的超韧PLA三元共混物的策略。首先，基于热力学预测，成功制备了核-壳PBS / PBAT结构，可作为PLA的增韧剂。其次，由于过氧化物和聚合物之间的反应优先级不同，可通过引入少量的过氧化物来调节PLA和PBS / PBAT之间的粘度比。通过将共连续的PBS / PBAT转移至具有最佳尺寸的液滴结构，并改善PLA与核-壳型PBAT-PBS之间的相容性，成功制备了两种具有高冲击强度和熔体强度的超增韧PLA三元共混物。所得的三元共混物显示出超强的韧性，并显着改善了缺口冲击强度（〜530 J / m）。借助弛豫时间谱分析和原子力显微镜（AFM），基于相转化理论，讨论了形态转变背后的机制。研究表明，不同组分的形态转变和改善的相容性共同为改善的机械性能做出了贡献。该研究提供了一种新方法，通过调整不同组分之间的粘度比来提高反应挤出中聚合物共混物的韧性。预期开发的三元共混物将广泛用于工业应用。