Aldehyde-amine crosslinked starch-based high-performance wood adhesive

IF 2.4 3区农林科学 Q1 FORESTRY

European Journal of Wood and Wood Products Pub Date : 2023-08-29 DOI:10.1007/s00107-023-01985-w

Chunxiao Yang, Hang Su, Guanben Du, Xiangyu Ren, Yingchen Wu, Huijun Zhang, Kelu Ni, Xin Ran, Jun Li, Wei Gao, Long Yang

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引用次数: 1

Abstract

Manufacturing green and sustainable bio-based adhesives is an effective strategy to alleviate both serious energy and environmental issues. Herein, based on the aldehyde–amine covalent reaction between dialdehyde starch (DAS) and polyamine (PA_6N), a hyperbranched crosslinked starch-based adhesive was prepared, which overcomes the disadvantage of poor water resistance of conventional starch-based adhesive. The imine groups (C = N) and aminal groups (N–C–N) produced by the reaction of dialdehyde starch and polyamines stably “weld” the molecular chains of dialdehyde starch and polyamine. In addition, the dense cross-linking network formed by the molecular chains stacking and entanglement also plays a crucial role in enhancing the water resistance of the adhesives. The FTIR, XPS, and ¹³C NMR indicated that the imine and aminal covalent bonds were formed between the starch molecular chain and the polyamine. The dry bonding strength of the modified starch adhesive reached 2.12 MPa, which was increased by 162% compared to the natural starch adhesive. The wet strength of the adhesive after 63 °C of hot/boiling water soaking for 3 h broke from 0 to 1.92/1.34 MPa. The proposed DAS-PA_6N starch-based adhesive has the advantages of low cost, high performance, and green sustainability, suggesting broad application prospects in aldehyde-free bio-based wood adhesives.

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醛胺交联淀粉基高性能木材胶粘剂

制造绿色和可持续的生物基粘合剂是缓解严重能源和环境问题的有效策略。基于二醛淀粉（DAS）与多胺（PA6N）的醛-胺共价反应，制备了超支化交联淀粉基胶粘剂，克服了传统淀粉基胶粘剂耐水性差的缺点。亚胺基团（C = N）二醛淀粉与多胺反应产生的氨基（N–C–N）稳定地“焊接”了二醛淀粉和多胺的分子链。此外，分子链堆叠和缠结形成的致密交联网络对提高胶粘剂的耐水性也起着至关重要的作用。FTIR、XPS和13C NMR表明，淀粉分子链和多胺之间形成了亚胺和氨基共价键。改性淀粉粘合剂的干粘合强度达到2.12MPa，与天然淀粉粘合剂相比提高了162%。63之后粘合剂的湿强度热/沸水浸泡3h的温度从0降至1.92/1.34MPa。所提出的DAS-PA6N淀粉基胶粘剂具有成本低、性能高、绿色可持续的优点，在无醛生物基木材胶粘剂中具有广阔的应用前景。

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来源期刊

European Journal of Wood and Wood Products 工程技术-材料科学：纸与木材

CiteScore

5.40

自引率

3.80%

发文量

124

审稿时长

6.0 months

期刊介绍： European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.