Developing degradable and self-healable elastomers composed of reusable resources is of great value but is rarely reported because of the undegradable molecular chains. Herein, we report a class of degradable and self-healable vitrimers based on non-isocyanate polyurethane elastomer. Such vitrimers are fabricated by copolymerizing bis(6-membered cyclic carbonate) and amino-terminated liquid nitrile rubber. The networks topologies can rearrange by transcarbonation exchange reactions between hydroxyl and carbonate groups at elevated temperatures; as such, vitrimers after reprocessing can recover 82.9–95.6% of initial tensile strength and 59–131% of initial storage modulus. Interestingly, the networks can be hydrolyzed and decarbonated in the strong acid solution to recover 75% of the pure di(trimethylolpropane) monomer. Additionally, the elastomer exhibits excellent self-healing efficiency (~88%) and fracture strain (~1,200%) by tuning the monomer feeding ratio. Therefore, this work provides a novel strategy to fabricate the sustainable elastomers with minimum environmental impact.

开发由可重复使用资源组成的可降解和可自修复的弹性体具有巨大价值，但由于不可降解的分子链，因此鲜有报道。在本文中，我们报告了基于非异氰酸酯聚氨酯弹性体的一类可降解和自修复的微粉。这种三元共聚物是通过共聚制备的bis（六元环状碳酸酯）和氨基封端的液态丁腈橡胶。网络拓扑结构可以通过在高温下羟基和碳酸酯基团之间的转碳酸交换反应进行重排；因此，后处理的微晶硅可以恢复初始拉伸强度的82.9–95.6％和初始储能模量的59–131％。有趣的是，网络可以在强酸溶液中水解和脱碳，以回收75％的纯二（三羟甲基丙烷）单体。此外，通过调节单体进料比例，弹性体还具有出色的自修复效率（〜88％）和断裂应变（〜1200％）。因此，这项工作提供了一种新颖的策略来制造对环境影响最小的可持续弹性体。