Poly(butylene adipate-co-terephthalate) (PBAT) copolyesters are indispensable components of degradable plastics, but their relatively low strength and barrier properties hamper their applications in daily life. Herein, poly(butylene adipate-co-carbonate-co-terephthalate) (PBACT) copolymers with different butylene adipate/butylene carbonate (A/C) content ratios were prepared by adding dimethyl carbonate (DMC) as the fourth monomer based on melt polycondensation. Specifically, the aromatic unit butylene terephthalate was fixed at 50% molar content, while the aliphatic unit consisting of butylene adipate (BA) and butylene carbonate (BC) units varied. The designed copolyesters maintained high toughness (>700%) and low glass transition temperature (<−13 °C). More appealingly, the insertion of DMC unit endowed the copolyester with a superior barrier performance. Considering its potential commercial feasibility, the PBACT copolyester was a preliminary scale-up prepared in a 5 L steel polymerization reactor, and the kilogram-scale PBACT material was subsequently blown into a high-performance film. It provides new insights into the modifications of PBAT copolyesters with a high barrier performance by incorporation of DMC.

中文翻译：

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通过掺入 DMC 对具有增强阻隔性能的 PBAT 共聚物进行筛选和放大改性


聚己二酸丁二醇酯-对苯二酸酯 （PBAT） 共聚酯是可降解塑料不可或缺的成分，但其相对较低的强度和阻隔性能阻碍了它们在日常生活中的应用。本文以熔融缩聚为基础，以碳酸二甲酯（DMC）为第四个单体，制备了具有不同己二酸丁二酯/碳酸丁二酯（A/C）含量比的聚己二酸丁二酯-碳酸酯-对苯二甲酸丁二酯（PBACT）共聚物。具体来说，芳香族单元对苯二甲酸丁二醇酯固定在 50% 摩尔含量，而由己二酸丁二醇酯 （BA） 和碳酸丁二醇酯 （BC） 单元组成的脂肪族单元则不同。设计的共聚酯保持了高韧性 （>700%） 和低玻璃化转变温度 （<-13 °C）。更吸引人的是，DMC 单元的插入赋予了共聚酯卓越的阻隔性能。考虑到其潜在的商业可行性，PBACT 共聚酯是在 5 L 钢制聚合反应器中制备的初步放大，随后将公斤级 PBACT 材料吹制成高性能薄膜。它为通过掺入 DMC 对具有高阻隔性能的 PBAT 共聚酯进行改性提供了新的见解。