Abstract
ABSTRACT Furfuryl alcohol, a biosourced material, is widely used in the foundry industry, and also as additive or modifier in the adhesives field. However, furanic resins have not been reported as being used alone as wood panel adhesives. In the present work furfuryl alcohol-aldehyde resins were prepared by reacting furfuryl alcohol with three different aldehydes, namely formaldehyde, glyoxal and glutaraldehyde. p-Toluene sulfonic acid and an acid self-neutralizing system were used as resin hardeners to prepare plywood and evaluate their bonding performances. Matrix assisted laser desorption ionization time of flight (MALDI-TOF), Fourier transform infrared (FTIR), nuclear magnetic resonance (13C-NMR) and thermomechanical analysis (TMA) were used to analyze the thermomechanical properties of the resins and the structure of the oligomers formed. The results showed that formaldehyde and glyoxal can react with furfurly alcohol to obtain resins of excellent performance. However, the reaction of glutaraldehyde with furfuryl alcohol appeared to be difficult, the self-condensation of furfuryl alcohol instead predominating. The acidity of the curing agent has a great influence on the bonding performance of the resin. The furfurly alcohol-glyoxal (FAG) resin showed also a good bonding strength and water resistance, higher than the standard requirements (≥ 0.7MPa), even when using an acid self-neutralizing system as hardener. The FAG resin was particularly good considering that no formaldehyde was used.
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