Biodegradable Poly(ethylene adipate- co -terephthalate) Foam with High Expansion Ratio and Excellent Compression Properties Prepared by Supercritical CO ₂ Foaming

dissolution capacity. Notably, compared to the low-molecular-weight PEAT foam, the high-molecular-weight PEAT foam exhibits superior compressive strength and compressive modulus. After 10 compression cycles, it retains excellent compressive strength and elasticity. Furthermore, the PEAT foam demonstrates outstanding biodegradability, achieving a weight loss of 64.03% within a 10 day degradation cycle. These results confirm that the PEAT foam produced via supercritical carbon dioxide foaming technology not only achieves ultrahigh expansion ratios and outstanding compressive properties but also aligns with contemporary societal demands for eco-friendliness and cost-effectiveness. This material combines excellent comprehensive performance with practical application potential, offering prospects for further research and engineering implementation.