北京大学刘允团队实现了生物来源的4-芳基-1,2-二硫戊烷用于高性能可回收聚二硫化物。2025年4月15日出版的《德国应用化学》杂志发表了这项成果。

可回收聚合物的发展为循环塑料经济的紧迫问题提供了解决方案。为此，人们越来越有兴趣扩大聚二硫化物的用途，聚二硫化物含有动态共价S-S键，可以实现内在的可降解性。硫辛酸及其衍生物是制备聚（二硫化物）最广泛使用的单体类别。然而，它们的物理性能通常处于热塑性塑料的软侧，在更广泛的应用中可能面临挑战。

研究组报道了一种从生物来源的苯酚醚及其开环聚合到芳基取代的聚二硫化物的新型芳基取代1,2-二硫戊环单体的可扩展合成。芳基取代聚二硫化物显示出高可回收性，且不失稳定性。芳基侧链的引入系统地改善了聚二硫醚的热性能。芳基取代的聚二硫酯的光学性能具有竞争力，交联网络的机械性能也具有竞争力，显示出在可持续材料中的应用潜力。

附：英文原文

Title: Bio-sourced 4-Aryl-1,2-Dithiolanes for Recyclable Poly(disulfide)s with High Performance

Author: Tianyu Zhu, Ruishi Lei, Bowen Wang, Tianyi Du, Wei Xia, Yun Liu

Issue&Volume: 2025-04-15

Abstract: The development of recyclable polymers presents a solution to the urgent issues of circular plastics economy. To this end, there is an increasing interest in expanding the utility of poly(disulfide)s, which contains dynamic covalent S–S bonds to enable intrinsic degradability. Lipoic acid and its derivatives represent the most widely used class of monomers for the preparation of poly(disulfide)s. However, their physical properties are usually on the soft side of thermoplastics and can face challenges in wider applications. In this contribution, we report a scalable synthesis of a new class of aryl-substituted 1,2-dithiolane monomers from biosourced phenol ethers and their ring-opening polymerization to aryl-substituted poly(disulfide)s. The aryl-substituted poly(disulfide)s display high recyclability without the cost of stability. The introduction of aryl side chains systematically improves the thermal properties of poly(disulfide)s. The optical properties of aryl-substituted poly(disulfide)s are competitive and so are the mechanical properties of the crosslinked network, showing potential for applications in sustainable materials.

DOI: 10.1002/anie.202503677

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202503677