Poly (butylene succinate-butylene terephthalate) (PBST) displays favorable foamability with the supercritical CO₂ as the blowing agent, but the foams behave serious shrinkage behavior. In this work, a serious of fully biodegradable PBST/poly (butylene succinate) (PBS) microcellular foams with low volume shrinkage ratio were fabricated with the co-blowing agent of CO₂ & N₂. The presence of PBS can not only improve the rheological behavior, crystallization and mechanical properties to alleviate shrinkage process, but also play the role of nucleating agent to promote cell nucleation. With the increasing content of PBS, the cell size of the foam decreases from 25.0 μm to 7.03 μm, the cell density increases from 8.84×10⁸ to 3.19×10¹⁰ cells/cm³ and the volume shrinkage ratio reduces from 62.10% to 47.81%. Furthermore, it is demonstrated that the introduction of N₂ can inhabit the shrinkage behavior of PBST/PBS foams effectively. With the introduction of 12 MPa CO₂ and 8 MPa N₂, the volume expansion ratio of PBST/PBS10 microcellular foam can achieve 10.6-fold with good dimensional stability.

聚（丁二酸丁二酯-对苯二甲酸丁二醇酯）（PBST）以超临界CO ₂为发泡剂表现出良好的发泡性，但泡沫表现出严重的收缩行为。_{本工作以CO 2}和N ₂共发泡剂制备了一种具有低体积收缩率的完全可生物降解的PBST/聚丁二酸丁二醇酯（PBS）微孔泡沫塑料。PBS的存在不仅可以改善流变行为、结晶和力学性能以减轻收缩过程，还可以起到成核剂促进细胞成核的作用。随着PBS含量的增加，泡沫的泡孔尺寸从25.0 μm减小到7.03 μm，泡孔密度从8.84×10 ⁸增加到3.19×10^10个细胞/cm ³，体积收缩率从62.10%降低到47.81%。此外，证明了N ₂的引入可以有效地抑制PBST/PBS泡沫的收缩行为。在12 MPa CO ₂和8 MPa N ₂的引入下，PBST/PBS10微孔泡沫的体积膨胀率可以达到10.6倍，尺寸稳定性好。