Herein, a ternary blend from poly(butylene succinate) (PBS), poly(propylene carbonate) (PPC), and poly(vinyl acetate) (PVAc) with improved crystallization rate, stiffness, and toughness was initially prepared via melt compounded. The influence of PVAc content on morphology, miscibility, thermal behavior, and rheological and mechanical properties was investigated. Scanning electron microscopy observation showed phase morphology of PBS/PPC/PVAc ternary blends evolved from sea-island dispersion to co-continuous structure. Dynamic mechanical analysis revealed that PBS and PPC were immiscible. The presence of PPC inhibited the crystallization of PBS, while simultaneous incorporation of PVAc and PPC promoted the crystallization. Furthermore, the introduction of PPC and PVAc enhanced the rheological properties of PBS. Unexpectedly, prominent improvement in tensile modulus, yield strength, and elongation was obtained for the PBS/PPC/PVAc ternary blend with 10 wt% PVAc due to the morphological evolution from sea-island to co-continuous structure, which was respectively increased by 93%, 52%, and 26% compared with neat PBS.

在本文中，最初通过熔融复合制备了聚（丁二酸丁二醇酯）（PBS）、聚（碳酸丙二酯）（PPC）和聚（醋酸乙烯酯）（PVAc）的三元共混物，具有改进的结晶速率、刚度和韧性。研究了 PVAc 含量对形态、混溶性、热行为以及流变和机械性能的影响。扫描电子显微镜观察显示 PBS/PPC/PVAc 三元共混物的相形态从海岛分散演变为共连续结构。动态力学分析表明 PBS 和 PPC 是不混溶的。PPC 的存在抑制了 PBS 的结晶，而 PVAc 和 PPC 的同时掺入促进了结晶。此外，PPC 和 PVAc 的引入增强了 PBS 的流变特性。不料，