Curing, Spectral and Thermal Study of Epoxy Resin of Bisphenol-C and Its Polyester Polyols Based Polyurethanes

Epoxy resin of bisphenol-C (EBC), its ricinoleate- and linoleate-based polyols have been cured using 525 wt% triethylamine and toluene-2,4-di-isocyanate at 100 degrees and 140 degrees C, respectively. Cured resins are insoluble in common solvents and characterized by IR, DSC and TGA. Amine-cured resin was thermally stable up to about 309-318 degrees C and followed 1.5-order degradation kinetics. Ricinoleate-based polyurethane was thermally stable up to about 215 degrees C and followed 0.43-, 0.75-, and 1.12-order degradation kinetics. Linoleate-based polyurethane was thermally stable up to about 260 degrees C and followed, respectively, 1.9- and 0.93-order degradation kinetics. Kinetic parameters are interpreted in light of resin structure and nature of hardeners used. Amine-cured epoxy resin possesses better thermal properties than those of its polyols-based polyurethanes.