Liu Shao, Zhong Mingxuan, Wang Xiangdong, Wang Yaqiao
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, People's Republic of China; Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing, People's Republic of China.
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, People's Republic of China; Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing, People's Republic of China.
Int J Biol Macromol. 2024 Dec;282(Pt 2):136782. doi: 10.1016/j.ijbiomac.2024.136782. Epub 2024 Oct 24.
High-expansion-ratio microcellular poly (butylene adipate-co-terephthalate) (PBAT) foams exhibit severe shrinkage, which hinders their industrial applications. This study provides a facile method to prepare low-shrinkage, high-compressive-strength and high-resilience PBAT foam. CEPBAT/PLA blends (CE = chain extender, PLA = polylactide) were prepared via in situ fibrillation to obtain CEPBAT/PLA-S (CEPBAT/PLA containing PLA spherical phase) foam containing PLA spheres and CEPBAT/PLA-F (CEPBAT/PLA containing PLA fiber phase) foam with PLA nanofibers. The effects of the PLA nanofibers and spheres on the antishrinkage and compression strength of the PBAT foams were studied. The PLA nanofibers exhibited a higher specific surface area than the PLA spheres and a supporting network structure for the PBAT foam, thereby improving its melt strength. As a result, the antishrinkage performance and compression strength of CEPBAT/PLA-F improved by 100 % and 180 %, respectively, compared with the neat PBAT foam after aging for 144 h. However, the permanent deformation of CEPBAT/PLA-F increased only slightly after ten compression cycles. CEPBAT/PLA-F showed better antishrinkage performance, compression strength, and resilience than CEPBAT/PLA-S owing to the interface effect of the PLA nanofibers, whose nanolinear network structure provides enhancement and a larger deformation range under pressure to reduce plastic deformation.
高膨胀比的微孔聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）泡沫表现出严重的收缩，这阻碍了它们的工业应用。本研究提供了一种简便的方法来制备低收缩、高抗压强度和高弹性的PBAT泡沫。通过原位纤维化制备了CEPBAT/PLA共混物（CE = 扩链剂，PLA = 聚乳酸），以获得含有聚乳酸球体的CEPBAT/PLA-S（含PLA球形相的CEPBAT/PLA）泡沫和含有聚乳酸纳米纤维的CEPBAT/PLA-F（含PLA纤维相的CEPBAT/PLA）泡沫。研究了聚乳酸纳米纤维和球体对PBAT泡沫抗收缩性和抗压强度的影响。聚乳酸纳米纤维比聚乳酸球体具有更高的比表面积，并且为PBAT泡沫提供了支撑网络结构，从而提高了其熔体强度。结果，与老化144小时后的纯PBAT泡沫相比，CEPBAT/PLA-F的抗收缩性能和抗压强度分别提高了100%和180%。然而，经过十次压缩循环后，CEPBAT/PLA-F的永久变形仅略有增加。由于聚乳酸纳米纤维的界面效应，CEPBAT/PLA-F比CEPBAT/PLA-S表现出更好的抗收缩性能、抗压强度和弹性，其纳米线性网络结构提供了增强作用，并在压力下具有更大的变形范围以减少塑性变形。
