An adhesive based on the reaction of a very fast reacting procyanidin-type condensed tannin, namely purified pine bark tannin, and food-grade non-toxic slow-reacting aldehydes derived from lignin was shown to satisfy well the relevant standards for bonding wood particleboard. Vanillin and a dialdehyde derivative of vanillin were the aldehydes used. The oligomers obtained and their distribution have been determined by matrix assisted laser ionization desorption time-of-flight (MALDI-TOF) mass spectrometry for the reactions with catechin used as a model compound and with the pine tannin itself, and by cross polarization magic angle spinning 13C nuclear magnetic resonance (CP MAS 13C NMR) for the reaction with pine tannin.
International Journal of Adhesion and Adhesives – Elsevier
Published: Oct 1, 2016
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