Preparation and characterization of non-isocyanate polyurethane resins derived from tannin of <i>Acacia mangium</i> bark for the modification of ramie fibers

Abstract The purpose of this research was to create bio-based non-isocyanate polyurethane (Bio-NIPU) resins derived from the tannin Acacia mangium Willd. bark for impregnation ramie fibres ( Boehmeria nivea L.) and investigate properties impregnated fibres. Tannin extracted A. using hot water. Tannin-bio-NIPU resin created dimethyl carbonate hexamine. Based on findings, it is possible conclude that extract can be used effectively as a renewable alternative toxic polyols in development tannin-Bio-NIPU resins. FTIR spectroscopy confirm urethane bond formed Thermal mechanical analysis were before after impregnation. This study shows time fiber 30 minutes. reaction between with forms C=O group confirmed by Spectroscopy. characterization results show has ability modify via order increase its properties, thus enhancing potential wider industrial application functional material.