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However, a trade\u2010off between precure water retention and postcure bonding strength remains a major challenge, and current strategies rarely achieve simultaneous enhancement of both properties. Inspired by the multi\u2010enhancement mechanisms of double\u2011network systems, we established a hierarchical dual\u2011network adhesive system. It involves the self\u2010assembly of chitosan into a compliant supramolecular framework via dynamic hydrogen bonding and electrostatic interactions, along with the additional formation of a stiff covalent crosslinked network during curing. This design achieves synergistic optimization of water retention and bonding strength. The \u201cskeleton\u2013tentacle\u201d structure formed by functionalized chitosan significantly enhanced water retention by 430% and was crucial to forming the dual\u2010network structure, improving wet shear strength by 445% and work of adhesion by 2133%. Additionally, the adhesive exhibited excellent mildew resistance and flame retardancy. The global warming potential was only 1.4\u00a0kg CO\n                    <jats:sub>2<\/jats:sub>\n                    eq, significantly lower than urea\u2013formaldehyde and phenol\u2013formaldehyde resins. This design provides a novel approach for developing high\u2010performance bio\u2010based adhesives and is expected to advance its practical application.\n                  <\/jats:p>","DOI":"10.1002\/chem.202502568","type":"journal-article","created":{"date-parts":[[2025,10,6]],"date-time":"2025-10-06T23:39:02Z","timestamp":1759793942000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Double\u2010Network Soy Protein Adhesives with Enhanced Water Retention and Bonding Strength"],"prefix":"10.1002","volume":"31","author":[{"given":"Jinbo","family":"Wang","sequence":"first","affiliation":[{"name":"MOE Key Laboratory of Wooden Material Science and Application Beijing Forestry University  Beijing 100083 P.R. China"},{"name":"Key Laboratory of Wood Science and Engineering Beijing Forestry University  Beijing 100083 P.R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Songwu","family":"Chen","sequence":"additional","affiliation":[{"name":"Guangxi Forestry Research Institute Guangxi Laboratory of Forestry  Nanning 530002 P.R. 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