Precise control and regulation of the cell structure in supercritical CO₂ (scCO₂) foaming is the key to boost the performance and extend the application of polymer foams. In this work, dynamic scCO₂ foaming method is proposed to fabricate thermoplastic polyurethane (TPU) foams with unique wrinkly structures by introducing a continuous scCO₂ flow field during scCO₂ saturation. The scCO₂ flow field applied on the TPU matrix generated intramolecular stress and resulted in the formation of wrinkles on the surface of cells. The structure of wrinkles was controlled by pivotal processing factors including foaming temperature, pressure, scCO₂ flow rate, and scCO₂ flow time. Attributing to the wrinkly structure, the wrinkled foams possessed superior compressive modulus, strength, recoverability, and energy absorption performance than conventional TPU foams, which make them a promising material for buffering and energy absorption applications. The dynamic scCO₂ foaming method opens avenue for scCO₂ foaming process involves dynamic field.

在超临界CO ₂ (scCO ₂ )发泡过程中精确控制和调节泡孔结构是提高聚合物泡沫性能和扩展应用的关键。在这项工作中，提出了动态 scCO ₂发泡方法，通过在 scCO ₂饱和期间引入连续的 scCO ₂流场来制造具有独特皱纹结构的热塑性聚氨酯 (TPU) 泡沫。施加在 TPU 基质上的scCO ₂流场产生分子内应力并导致细胞表面形成皱纹。皱纹的结构受关键加工因素控制，包括发泡温度、压力、scCO ₂流速和scCO₂流动时间。由于褶皱结构，褶皱泡沫比传统的TPU泡沫具有优异的压缩模量、强度、可恢复性和能量吸收性能，这使其成为缓冲和能量吸收应用的有前途的材料。动态scCO ₂发泡方法为scCO ₂发泡过程开辟了道路，涉及动态领域。