실시간 In-situ IR을 이용한 PTMG, IPDI, Dimethylol Alkanoic Acid계 폴리우레탄 프리폴리머의 반응속도론 연구

Abstract

Kinetic study of the polyurethane prepolymer formation between isophorone diisocyanat e(IPDI), poly (oxytetramethylene)glycol(PTMG), and dimethylol alkanoic acid(DMPA,DMBA) were studied in the batch system by using quantitative in-situ IR spectroscopy. The reaction rate was obtained from monitoring the change of NCO (2265 cm^-1) and C=O (1725 cm^1 ) stretching band in series IR spectra. The reaction is in accord with the first-or der for the concentration of hydroxyl groups and isocyanate group respectively, which conform to the second-order law entirely. The activation parameters obtained from the evaluation of kinetic data are △H^#=58.18 kJ/mol, △S^#=-95.98 J/mol·K and Ea=61.07 kJ/mol in bulk polymerization between PTMG and IPDI. also, The activation parameters inspected reaction of Dimethylol alkanoic free acid and IPDI of [NCO]/[OH] ratio of 1.0 at various temperature.