The effect of a bio-based macromolecule, poly(butylene adipate-co-terephthalate) (PBAT), on the crystallization and foaming behavior of poly(lactic acid) (PLA) was evaluated. The crystallization kinetics results show that the addition of PBAT improved the crystallization of PLA by increasing the overall crystallinity and enhancing the crystal morphology of PLA. The massive crystallization zones may have prevented the escape of foaming gases to the surrounding area; the expansion ratio of the PLA foams increased from 4.87 to 10.94. Thus, a novel macromolecular crystallization nucleating agent for PLA was developed; the effect of the crystallization of PLA on its foaming behavior was also investigated. A high expansion ratio and finer cellular structure of PLA foam were obtained by optimizing the PBAT content.

中文翻译：

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聚（己二酸丁二醇酯-共对苯二甲酸酯）作为高分子成核剂对可生物降解聚乳酸结晶和发泡行为的影响

评估了生物基大分子聚（己二酸丁二醇酯-共聚对苯二甲酸酯）（PBAT）对聚（乳酸）（PLA）结晶和发泡行为的影响。结晶动力学结果表明，PBAT的加入通过提高PLA的整体结晶度和增强PLA的晶体形态来改善PLA的结晶。巨大的结晶区可能阻止了泡沫气体逃逸到周围区域；PLA 泡沫的膨胀比从 4.87 增加到 10.94。因此，开发了一种新型的聚乳酸大分子结晶成核剂；还研究了 PLA 结晶对其发泡行为的影响。通过优化 PBAT 含量，获得了 PLA 泡沫的高膨胀比和更精细的多孔结构。