Bio-based “thiol-epoxides” thermosets containing dynamic cross-linked network topologies, permanent cross-linking and recyclability have been successfully utilized in coatings, adhesives and composites. However, these materials typically have a low glass transition temperature and limited mechanical strength. Combining excellent mechanical properties with thermal properties remains a significant challenge. In this study, we developed a recyclable itaconic acid-based epoxy thermoset material with high glass transition temperature and tensile strength through thiol-olefin/thiol-epoxy click reaction and alkyl bond radical copolymerization to construct a hybrid cross-linked network. The tensile strength reached up to (105.9 MPa) while maintaining a high T_g (93.3°C), which is the highest value reported in the literature so far. In addition, the itaconic acid-based epoxy has excellent recyclable processing, self-healing properties, high hardness, solvent resistance, and surface bond strength as an adhesive and coating. The results hold potential applications in achieving sustainable development in coatings and adhesives.

中文翻译：

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含有混合交联网络的可回收生物基环氧树脂

含有动态交联网络拓扑、永久交联和可回收性的生物基“硫醇-环氧化物”热固性材料已成功用于涂料、粘合剂和复合材料。然而，这些材料通常具有低玻璃化转变温度和有限的机械强度。将优异的机械性能与热性能相结合仍然是一项重大挑战。在这项研究中，我们通过硫醇-烯烃/硫醇-环氧点击反应和烷基键自由基共聚合构建了一种混合交联网络，开发了一种具有高玻璃化转变温度和拉伸强度的可回收衣康酸基环氧热固性材料。_{在保持高 T g}的同时，拉伸强度达到 (105.9 MPa)(93.3°C)，这是迄今为止文献报道的最高值。此外，衣康酸基环氧树脂作为粘合剂和涂料具有优异的可回收加工性、自愈性、高硬度、耐溶剂性和表面结合强度。该结果在实现涂料和粘合剂的可持续发展方面具有潜在的应用价值。