Herein, biodegradable polylactide (PLA) foams were prepared by supercritical CO₂. To address the foaming challenges posed caused by the low crystallization rate and the weak melt strength of PLA, the blending of PLA and poly(butyleneadipate-co-terephthalate) (PBAT) was adopted in this work, the diphenylmethane diisocyanate (MDI) was utilized to boost the compatibility and rheological features of the PLA/PBAT combination. The effects of MDI and PBAT on the crystallization and rheological of the blends were studied. In PLA/PBAT foam, the density prepared was adjustable from 0.02 to 0.025 g/cm³, and the heat-conductivity was a minimum of 0.028 W/(m·K). In addition, the effect of PBAT on PLA cushioning performance was studied, the PLA/PBAT foam prepared has good mechanical properties, which can be used for cushioning packaging and heat insulation. The hardness of the PLA/PBAT blend foam slowly reduced as the PBAT increased, and the elasticity gradually increased. Notably, with 10 phr of PBAT, the compressive strength of the blend foam at 25 ℃ and 60 ℃ was 57 KPa and 55 KPa, respectively. This work broadens the application prospect of PLA and has a positive impact on promoting the high-value utilization of biobased polymers.

中文翻译：

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由超临界 CO2 制备的轻质绝缘聚丙交酯/聚（己二酸丁二酯-对苯二甲酸酯）泡沫，具有良好的缓冲性能


在此，通过超临界 CO₂ 制备了可生物降解的聚丙交酯 （PLA） 泡沫。为了解决 PLA 的低结晶速率和弱熔体强度带来的发泡挑战，本工作采用了 PLA 和聚（丁二酸丁二酯-对苯二甲酸酯）（PBAT） 的共混，利用二苯基甲烷二异氰酸酯 （MDI） 来提高 PLA/PBAT 组合的相容性和流变特性。研究了 MDI 和 PBAT 对共混物结晶和流变性的影响。在 PLA/PBAT 泡沫中，制备的密度在 0.02 至 0.025 g/cm³ 范围内可调，导热系数最小为 0.028 W/（m·K）。此外，研究了PBAT对PLA缓冲性能的影响，制备的PLA/PBAT泡沫具有良好的力学性能，可用于缓冲包装和隔热。PLA/PBAT 共混泡沫的硬度随着 PBAT 的增加而缓慢降低，弹性逐渐增加。值得注意的是，使用 10 份 PBAT 时，共混泡沫在 25 °C 和 60 °C 下的抗压强度分别为 57 KPa 和 55 KPa。这项工作拓宽了 PLA 的应用前景，对促进生物基聚合物的高值化利用具有积极影响。