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

Polymers

Claudio Del Menezzi¹  Luc Delmotte²  Siham Amirou³  Antonio Pizzi³  Xuedong Xi³ 

[1] Department of Forestry Engineering, Faculty of Technology, University of Brasilia, Brasília 70910-900, Brazil;IS2M, Institut de Science des Matériaux de Mulhouse, CNRS LRC 7228, 15, rue Jean Starcky, BP 2488, 68057 Mulhouse, France;LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France;

关键词: citric acid binder;    adhesives;    13C NMR;    MALDI ToF;    esterification reactions;    wood;    wood veneers;    LVL;   

DOI  :  10.3390/polym10080833

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown