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Polymers 2018, 10(8), 833; https://doi.org/10.3390/polym10080833

Reactions with Wood Carbohydrates and Lignin of Citric Acid as a Bond Promoter of Wood Veneer Panels

1
Department of Forestry Engineering, Faculty of Technology, University of Brasilia, Brasília 70910-900, Brazil
2
LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France
3
IS2M, Institut de Science des Matériaux de Mulhouse, CNRS LRC 7228, 15, rue Jean Starcky, BP 2488, 68057 Mulhouse, France
*
Author to whom correspondence should be addressed.
Received: 24 June 2018 / Revised: 23 July 2018 / Accepted: 27 July 2018 / Published: 28 July 2018
(This article belongs to the Collection Polymeric Adhesives)
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Abstract

The reaction of citric acid with wood veneers was studied by Cross Polarization Magic Angle Spinning Nuclear Magnetic Resonance (CP MAS 13C NMR) and matrix assisted laser desorption ionization time of flight (MALDI ToF) mass spectrometry. The analysis showed that reactions of citric acid occurred with both lignin and carbohydrate constituents of wood. The reactions occurring are esterifications between the carboxylic acid functions of citric acid and the numerous aromatic and aliphatic hydroxyl groups of the main wood constituents. Reaction of citric acid with glucose as a simple model compound of carbohydrates hydroxyl groups also yielded reactions leading to linear and branched oligomers by esterification. The result indicate that the reactions of esterification are accompanied in parallel by some internal rearrangements of lignin. The applied results on bonding wide flat wood surfaces such as veneers to obtain LVL panels yielded excellent strength results even if the conditions of pressing were more drastic than what is usual for this application. The applied bonding results have shown that citric acid has great potential to be used as a bio-binder for wood veneers. View Full-Text
Keywords: citric acid binder; adhesives; 13C NMR; MALDI ToF; esterification reactions; wood; wood veneers; LVL citric acid binder; adhesives; 13C NMR; MALDI ToF; esterification reactions; wood; wood veneers; LVL
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Del Menezzi, C.; Amirou, S.; Pizzi, A.; Xi, X.; Delmotte, L. Reactions with Wood Carbohydrates and Lignin of Citric Acid as a Bond Promoter of Wood Veneer Panels. Polymers 2018, 10, 833.

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