PBAT is considered a leading eco-friendly polymer known for its exceptional biodegradability and mechanical properties. However, the production of high-performance PBAT foam remains challenging owing to poor foaming ability and intrinsic shrinkage. Herein, this study presents a flexible approach to prepare super-elastic and ultrafast-degradable PBAT/polybutylene succinate (PBS) foams achieved by microcellular foaming with CO & N as co-blowing agents. Firstly, the SEM, FTIR, as well as XPS spectra, confirmed a uniform and miscible distribution of PBS. Further, the crystallization kinetics and rheological analysis demonstrated that PBS effectively promoted crystallization and molecular chain entanglement. Thus, the PBAT/PBS foam exhibited significantly refined cellular structure, higher expansion ratio of 20.3, and restricted shrinkage of less than 4 %. More importantly, compared with neat PBAT foam, the compression strength of PBAT/PBS foam was dramatically enhanced by 47.7 %, and the energy loss coefficient was pronouncedly reduced by 58.8 % under the expansion ratio of 15.0. Meanwhile, the PBAT/PBS foam showed a thermal conductivity as low as 35.9 mW/m·K, enhanced hydrophobicity, and an exceptionally rapid degradation ratio. Considering the eco-friendly and flexible characteristics of this process, anti-shrinkage and ultrafast-degradable PBAT/PBS foams with improved mechanical and thermal insulation performance present promising prospects to replace the nondegradable polymer foams.

中文翻译：

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超快降解、超弹性PBAT/聚丁二酸丁二醇酯泡沫，具有稳定的泡孔结构和增强的隔热性能

PBAT 被认为是一种领先的环保聚合物，以其卓越的生物降解性和机械性能而闻名。然而，由于发泡能力差和固有收缩，高性能 PBAT 泡沫的生产仍然具有挑战性。在此，本研究提出了一种灵活的方法来制备超弹性和超快降解的 PBAT/聚丁二酸丁二醇酯 (PBS) 泡沫，通过以 CO 和 N 作为共发泡剂进行微孔发泡来实现。首先，SEM、FTIR 以及 XPS 光谱证实了 PBS 的均匀且可混溶的分布。此外，结晶动力学和流变学分析表明PBS有效促进结晶和分子链缠结。因此，PBAT/PBS泡沫表现出显着细化的泡孔结构、高达20.3的膨胀比和小于4%的收缩率。更重要的是，与纯PBAT泡沫相比，在15.0的发泡倍率下，PBAT/PBS泡沫的压缩强度显着提高了47.7%，能量损失系数显着降低了58.8%。同时，PBAT/PBS泡沫的导热系数低至35.9 mW/m·K，疏水性增强，降解速度极快。考虑到该工艺的环保和柔性特性，具有改善的机械和隔热性能的抗收缩和超快降解的PBAT/PBS泡沫具有替代不可降解聚合物泡沫的广阔前景。