Research Progress on Bio‐Based Epoxy Vitrimers: A Review

ABSTRACT Conventional epoxy resins, widely used in high‐performance applications, face significant sustainability challenges due to their permanent crosslinking and reliance on fossil‐derived bisphenol A, leading to resource depletion, health concerns, and end‐of‐life disposal issues. In response, bio‐based epoxy vitrimers—covalent adaptable networks that integrate renewable feedstocks with dynamic covalent bonds—have emerged as a promising solution to combine high performance with circularity. This review systematically summarizes recent progress in recyclable bio‐based epoxy vitrimers, covering five major classes of renewable feedstocks (lignin derivatives, vegetable oils, biomass‐derived acids, sugar‐derived platform molecules, and other natural compounds) and five dynamic covalent chemistries (transesterification, disulfide, imine, Diels–Alder, and multiple dynamic bonds). The structure–property relationships, reprocessability, self‐healing ability, degradability, and closed‐loop recycling potential are critically analyzed. Finally, key challenges and future directions are discussed, including the development of catalyst‐free low‐energy systems, decoupling of service and reprocessing temperatures, feedstock valorisation, mechanical robustness, and scalable closed‐loop recycling. This review aims to guide the rational design of sustainable epoxy vitrimers and accelerate their integration into circular material technologies.