Epoxy resins‐based engineering plastics are indispensable in the global economy, but they have created a serious waste crisis caused by their chemical cross‐linked networks. To solve this problem, current strategies often require the assistance of catalysts or solvents at the expense of thermal and mechanical performance. In this work, a high‐performance epoxy resin featuring dynamic ester and disulfide bonds (TDS) is reported, which exhibits higher thermal and mechanical properties than common engineering plastics, i.e., tensile strength and modulus of 66.6 MPa and 2.63 GPa, flexural strength and modulus of 103.2 MPa and 3.52 GPa, and glass transition temperature (Tg) of 133 °C. Moreover, the reversible transformation between aromatic disulfide bonds and thiyl radicals endows TDS epoxy resin with autonomous visualization of damage and healing. In addition, the harmonious interplay between disulfide and ester bonds‐promoted by tertiary amine accelerated the topological network rearrangements, enabling TDS to easily reshape and weld. Specifically, TDS can be completely degraded in pure water at 200 °C without any catalyst, and the degraded products can be directly re‐polymerized to achieve green closed‐loop recycling. This work proposes a simple and economical strategy for the development of epoxy resin‐based cutting‐edge engineering plastics that are both functional and sustainable.

中文翻译：

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具有损伤修复自主可视化和绿色闭环回收功能的坚固环氧树脂


环氧树脂基工程塑料在全球经济中不可或缺，但其化学交联网络造成了严重的废物危机。为了解决这个问题，当前的策略通常需要催化剂或溶剂的帮助，但会牺牲热性能和机械性能。在这项工作中，报道了一种具有动态酯键和二硫键（TDS）的高性能环氧树脂，它比普通工程塑料具有更高的热性能和机械性能，即拉伸强度和模量分别为66.6 MPa和2.63 GPa，弯曲强度和模量为 103.2 MPa 和 3.52 GPa，玻璃化转变温度 (Tg) 为 133 °C。此外，芳香族二硫键和硫基自由基之间的可逆转化赋予TDS环氧树脂损伤和愈合的自主可视化能力。此外，叔胺促进的二硫键和酯键之间的和谐相互作用加速了拓扑网络的重排，使TDS能够轻松重塑和焊接。具体来说，TDS在200℃纯水中无需任何催化剂即可完全降解，降解产物可直接重新聚合，实现绿色闭环回收。这项工作提出了一种简单而经济的策略，用于开发功能性且可持续的环氧树脂基尖端工程塑料。