中国科学院化学研究所Xia Dong研究小组近日取得一项新成果。经过不懈努力，他们研究出在温和条件下具有快速自愈能力的二硫化物基聚(醚-b-酰胺)共聚物。2023年12月19日，国际知名学术期刊《中国化学》发表了这一成果。

在这项研究中，研究人员以4,4′-二硫代二丁酸(DTDBA)、异佛尔酮二胺(IPDA)和聚四亚甲基氧化物(PTMO)为原料，采用两步法合成了温和条件下具有快速自愈能力的二硫基聚(醚-b-酰胺)共聚物。具有不对称结构和较大位阻的IPDA的掺入不仅有效地减少了规则氢键的数量，而且抑制了聚酰胺片段的结晶，使合成的聚(醚-b-酰胺)共聚物具有非晶结构特征。

研究人员发现，由于二硫键和氢键的链段迁移和复合的结合因素，在40℃下，PEBADS-I611划痕和损伤的力学性能可以在经过11分钟和3小时的修复后完全自愈。

附：英文原文

Title: A disulfide-based poly(ether-b-amide) copolymer with rapid self-healing ability under moderate conditions

Author: Weijian Lu, Ping Zhu, Ying Zhao, Dujin Wang, Xia Dong

Issue&Volume: 2023-12-19

Abstract: A disulfide-based poly(ether-b-amide) copolymer with rapid self-healing capability under moderate conditions was synthesized from 4,4’-dithiodibutyric acid (DTDBA), isophorondiamine (IPDA) and poly(tetramethylene oxide) (PTMO) based on a two-step method. The incorporation of IPDA with asymmetric structure and substantial steric hindrance not only effectively decreased the number of regular H-bonds, but also inhibited the crystallization of polyamide segments, imparting the synthesized poly(ether-b-amide) copolymer with an amorphous structural feature. Based on the coordination of segmental diffusion and recombination of disulfide bonds and hydrogen bonds, the scratches and damaged mechanical properties of PEBADS-I611 could be completely self-healed after healing at 40 °C for only 11 min and 3 h, respectively.

DOI: 10.1002/cjoc.202300603

Source: https://onlinelibrary.wiley.com/doi/10.1002/cjoc.202300603