A Reprocessable Wood Composite Based on Delignified Wood and Epoxy Dynamic Polymer

ABSTRACT This study aims to address the drawback of traditional epoxy resin‐based wood composites being non‐reusable after damage by employing epoxy vitrimer (EPV) containing dynamic imine bonds to infiltrate delignified wood (DW) frameworks, fabricating a reprocessable multilayer wood composite (MLWC) through cross‐lamination. Experimental results demonstrated that while maintaining a high tensile strength (63.46 MPa) comparable to natural wood (NW), the material achieves interlayer damage repair and multiple reprocessing capabilities via reversible exchange reactions of dynamic imine bonds at elevated temperatures. After hot‐pressing treatment, the strength recovery rate of bending‐damaged specimens reached 63.87%. Multiple reprocessing tests confirmed that the material maintains a stable chemical structure and exhibits no significant deterioration in thermomechanical properties following microstructural reorganization. Although reprocessing reduced tensile strength to 17.34 MPa due to wood fiber fracture, mechanical performance showed no progressive decline with reprocessing cycles. The developed composite exhibits excellent comprehensive properties, demonstrating potential as a low‐cost and sustainable structural material for applications such as structural components or automotive interiors.