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Soy protein isolate-based polyamides as wood adhesives

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Abstract

Soy protein isolate was reacted first with maleic anhydride and then hexamethylenediamine to synthesis soy protein isolate-based polyamides (SPIPA). Its bonding properties were measured by preparing laboratory three-layer plywood. Furthermore, a silane coupling agent (KH560), citric acid and maleic anhydride were added as cross-linkers to the SPIPA glue mix before hot pressing the panels. ATR FT-MIR and MALDI-ToF were used to determine the structures of the SPIPA, and thermomechanical analysis was used to analyze its thermomechanical properties. The results show that maleic anhydride reacts with amino acids in the soy protein molecule and then reacts with hexamethylenediamine to form carbamate-structured polyamides. This is confirmed by the ATR FT-MIR and MALDI-ToF results. Moreover, structural analysis indicates that a large number of branched structures are formed and occur in the SPIPA, rendering possible the formation of a network during curing, ensuring the bonding performance of the adhesive. The SPIPA adhesive presented good bonding strength and water resistance above the standard requirements of China National Standard GB/T 9846-2015. In particular, when maleic anhydride was added as a cross-linking agent, namely the SPIPA-MA adhesive, the panels’ dry and wet shear strengths were improved so that it can be considered as a suitable soy protein-based wood adhesive.

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Acknowledgements

The first and the fourth author thank the China Scholarship Council for the study bursary granted to them. The LERMAB of the University of Lorraine is supported by a grant by the French National Research Agency (ANR) as part of the Laboratory of Excellence (Labex) ARBRE. This paper was also funded by ERA CoBioTech, L’Agence nationale de la recherche (ANR) under WooBAdh title.

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Authors and Affiliations

  1. LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000, Épinal, France

    Xuedong Xi, Antonio Pizzi, Xinyi Chen & Siham Amirou

  2. Yunnan Key Laboratory of Wood Adhesives and Glue Products, Southwest Forestry University, Kunming, 650224, China

    Xuedong Xi & Xinyi Chen

  3. LERMAB, University of Lorraine, Boulevard des Aiguillettes, 54000, Nancy, France

    Christine Gerardin

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  1. Xuedong Xi
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  2. Antonio Pizzi
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  3. Christine Gerardin
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  4. Xinyi Chen
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  5. Siham Amirou
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Correspondence to Antonio Pizzi.

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Xi, X., Pizzi, A., Gerardin, C. et al. Soy protein isolate-based polyamides as wood adhesives. Wood Sci Technol 54, 89–102 (2020). https://doi.org/10.1007/s00226-019-01141-9

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