High-performance poly(lactic acid) (PLA) foam has been recognized as a promising material because of its biodegradability. However, low flexibility and foamability of PLAs has limited its use in different fields. In this study, a blend-toughening technology was used to toughen PLA and prepare flexible foams. The mechanical properties of PLA blends were evaluated, and the cellular structure of these foaming blends was characterized. The results show that the blending components significantly affected the overall mechanical properties and foaming behavior of PLA. The toughness of PLA was enhanced by adding poly(butylene adipate-co-terephthalate) (PBAT) and rigid particles. The rheological behavior of PLA was also affected by adding PBAT. Therefore, the cellular structure of the PLA foams was affected. A constitutive model was also used to fit the experimental results of the compression property of the PLA foam.

中文翻译：

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柔性聚乳酸共混泡沫的制备及性能

高性能聚乳酸 (PLA) 泡沫因其可生物降解性而被认为是一种很有前途的材料。然而，PLAs 的低柔韧性和发泡性限制了其在不同领域的应用。在这项研究中，混合增韧技术用于增韧 PLA 并制备柔性泡沫。对 PLA 共混物的机械性能进行了评估，并对这些发泡共混物的多孔结构进行了表征。结果表明，共混组分显着影响了 PLA 的整体力学性能和发泡行为。通过添加聚（己二酸丁二醇酯 - 共对苯二甲酸酯）（PBAT）和刚性颗粒，增强了 PLA 的韧性。添加 PBAT 也会影响 PLA 的流变行为。因此，PLA泡沫的多孔结构受到影响。