{"title":"New ester-type chemical bonding wood adhesion with a dicarboxylic acid compound","authors":"Daisuke Ando, Kenji Umemura, Hidefumi Yamauchi","doi":"10.1007/s00226-024-01621-7","DOIUrl":null,"url":null,"abstract":"<div><p>Wood adhesion is one of the fundamental joint technologies for wood-based materials. We focused on an unprecedented chemical bonding wood adhesion. With the final goal of water-resistant wood adhesion using dicarboxylic acid compounds with straight alkyl chains, this study clarified the difference of adhesiveness between glutaric acid (GA) and citric acid (CA) to explore the direct effects of chemical bonding type adhesion on physical properties. In the prepared wood-based moldings, the structural analysis with 2D-NMR of the interphase between GA or CA and wood surfaces revealed that GA adhesion is cleaner and more reactive than CA adhesion, without any side reactions. GA reacted with the wood powder surface. In addition, the water resistance treatments of the GA-type wood-based molding showed a thickness reversibility that is not observed with CA-adhesion. The results indicate that GA-adhesion is very likely a chemical bonding type of wood adhesion, considering the molding process under high temperature and pressure conditions. The physical properties of the molding were evaluated to determine the adhesion properties. GA-type wood-based molding was tougher and more water-resistant than CA-type wood-based molding. The physical properties were attributed to the side-chain structure of GA. The results indicate that dicarboxylic acid compounds could be superior wood adhesives, and other dicarboxylic acids could be used for wood adhesion and the expression of material properties owing to their various side chain structures. Furthermore, the material properties could be controlled by considering the chemical structure of adhesive compounds in the future.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"59 1","pages":""},"PeriodicalIF":3.1000,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01621-7.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Wood Science and Technology","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s00226-024-01621-7","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"FORESTRY","Score":null,"Total":0}
引用次数: 0
Abstract
Wood adhesion is one of the fundamental joint technologies for wood-based materials. We focused on an unprecedented chemical bonding wood adhesion. With the final goal of water-resistant wood adhesion using dicarboxylic acid compounds with straight alkyl chains, this study clarified the difference of adhesiveness between glutaric acid (GA) and citric acid (CA) to explore the direct effects of chemical bonding type adhesion on physical properties. In the prepared wood-based moldings, the structural analysis with 2D-NMR of the interphase between GA or CA and wood surfaces revealed that GA adhesion is cleaner and more reactive than CA adhesion, without any side reactions. GA reacted with the wood powder surface. In addition, the water resistance treatments of the GA-type wood-based molding showed a thickness reversibility that is not observed with CA-adhesion. The results indicate that GA-adhesion is very likely a chemical bonding type of wood adhesion, considering the molding process under high temperature and pressure conditions. The physical properties of the molding were evaluated to determine the adhesion properties. GA-type wood-based molding was tougher and more water-resistant than CA-type wood-based molding. The physical properties were attributed to the side-chain structure of GA. The results indicate that dicarboxylic acid compounds could be superior wood adhesives, and other dicarboxylic acids could be used for wood adhesion and the expression of material properties owing to their various side chain structures. Furthermore, the material properties could be controlled by considering the chemical structure of adhesive compounds in the future.
木材粘合是人造板的基本接合技术之一。我们重点研究了一种前所未有的化学键合木材粘合剂。以使用直烷基链的二羧酸化合物实现防水木材粘合为最终目标，本研究明确了戊二酸（GA）和柠檬酸（CA）粘合性的差异，以探索化学键合型粘合对物理性质的直接影响。在制备的木基模塑中，利用 2D-NMR 对 GA 或 CA 与木材表面的相间结构进行分析，结果表明 GA 的粘合比 CA 的粘合更清洁、反应性更强，且无任何副反应。GA 与木粉表面发生了反应。此外，GA 型木基模塑的耐水性处理显示出厚度可逆性，而 CA 粘合则没有这种现象。结果表明，考虑到高温高压条件下的模塑过程，GA 吸附很可能是一种化学键型的木材粘合。对模塑物的物理性质进行了评估，以确定其粘合性能。GA 型木基模塑比 CA 型木基模塑更坚韧、更耐水。这些物理性能与 GA 的侧链结构有关。研究结果表明，二羧酸化合物可作为优质的木材粘合剂，其他二羧酸也可用于木材粘合，并因其不同的侧链结构而表现出不同的材料特性。此外，未来还可通过考虑胶粘剂化合物的化学结构来控制材料特性。
期刊介绍：
Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.
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