Low curing temperature tannin-based non-isocyanate polyurethane (NIPU) wood adhesives: Preparation and properties evaluation

Bio-sourced glycerol diglycidyl ether (GDE) has been used in appropriate proportions as an enhancer to decrease the curing temperature, and improve the bonding performance, while reducing the emission of harmful substances, such as hexamethylenediamine, in the preparation process of tannin-based NIPU adhesives. The route of suggested enhancement was investigated by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass...