This project aims to develop high-performance bio-based adhesives from lignin, a renewable and abundant biomass resource. The research focuses on developing a green and mild demethylation strategy to convert methoxy groups in lignin into phenolic hydroxyl groups. This modification is expected to significantly enhance the reactivity of lignin, thereby promoting crosslinking reactions and leading to improved bonding performance and durability. In addition, the modified lignin has great potential for the development of high-value polymeric materials.