Strong and Weather‐Resistant Wood Bonding Enabled by Cell Wall–Inspired Ether‐Anchored Lignin

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Abstrakt

The weather resistance of bonding interfaces is a crucial prerequisite for scaling up bio‐based adhesives in the plywood industry; however, achieving a balance between mechanical robustness and green sustainability remains a major challenge. Inspired by the hierarchical composite interfaces of natural wood cell walls, a bioinspired lignin–carbohydrate matrix interfacial design strategy is proposed. Through controlled etherification between trimethylolpropane triglycidyl ether (TMPTE), lignin, and cellulose, lignin molecules are covalently anchored onto wood fibers, constructing a robust cross‐linked network analogous to natural cell wall architecture. The resulting bio‐adhesive exhibits exceptional bonding performance, with the dry strength enhanced from 1.11 ± 0.15 to 12.57 ± 1.25 MPa and the wet strength increased from 0 to 3.06 ± 0.38 MPa, surpassing most conventional petroleum‐based adhesives. Moreover, the adhesive maintains structural integrity under extreme conditions, including boiling water, cryogenic, high‐temperature, acidic/alkaline, and organic solvent environments. This work breaks through the long‐standing limitation of poor weather resistance in bio‐based adhesives and establishes a feasible and sustainable pathway toward robustness, low‐carbon structural bonding materials.

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