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Regrettably, the performance of the resin synthesized using glyoxal to directly replace all formaldehyde is not totally satisfactory, especially as it has almost no water resistance. This makes such a simple alternative fail to be suitable for industrial production. To prepare an environment-friendly glyoxal-based adhesive with good bonding performance, the work presented here relies first on reacting citric acid and hexamethylene diamine, producing a polyamide, with glyoxal, and then crosslinking it, thus synthesizing a thermosetting resin (namely CHG) adhesive and applying it for plywood bonding. The plywood prepared exhibits excellent dry and wet shear strength, which are better than GB\/T9846-2015 standard requirements (\u22650.7 MPa), and even after being soaked in hot water at 63 \u00b0C for 3 h, its strength is still as high as 1.35 MPa. The CHG resin is then potentially an adhesive for industrial application for replacing UF (urea-formaldehyde) and MUF (melamine-urea-formaldehyde) adhesives for wood composites.<\/jats:p>","DOI":"10.3390\/polym14142819","type":"journal-article","created":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T03:50:36Z","timestamp":1657597836000},"page":"2819","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["A Green Resin Wood Adhesive from Synthetic Polyamide Crosslinking with Glyoxal"],"prefix":"10.3390","volume":"14","author":[{"given":"Qianyu","family":"Zhang","sequence":"first","affiliation":[{"name":"Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Materials, Southwest Forestry University, Kunming 650224, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaoxiang","family":"Xu","sequence":"additional","affiliation":[{"name":"Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Materials, Southwest Forestry University, Kunming 650224, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9749-7185","authenticated-orcid":false,"given":"Antonio","family":"Pizzi","sequence":"additional","affiliation":[{"name":"LERMAB, University of Lorraine, 88000 Epinal, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6502-6493","authenticated-orcid":false,"given":"Hong","family":"Lei","sequence":"additional","affiliation":[{"name":"Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Materials, Southwest Forestry University, Kunming 650224, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuedong","family":"Xi","sequence":"additional","affiliation":[{"name":"Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Materials, Southwest Forestry University, Kunming 650224, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guanben","family":"Du","sequence":"additional","affiliation":[{"name":"Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Materials, Southwest Forestry University, Kunming 650224, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Pizzi, A., Papadopoulos, A.N., and Policardi, F. 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