실시간 In-situ IR을 사용한 벌크상 Poly(oxytetramethylene) Glycol과 Isophorone Diisocyanate의 반응속도론 연구

Abstract

Using quantitative real-time In-situ infrared (In-situ IR) spectroscopy, kinetic study of a reaction between isophoron diisocyanate (IPDI) and poly(oxytetramethylene) glycol (PTMG) was carried out. 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 was in accordance with the first-order reaction for each concentration of hydroxyl groups and isocyanate group, respectively, however, the overall reaction conformed to the second-order law. In the bulk polymerization between PTMG and IPDI, with ratio of [NCOJ/[OH] equal to 1.0 at various temperatures, the activation parameters obtained from the evaluation of kinetic data were △H^* = 58.18 kJ/mol, △S^# = -95.98 J/molㆍK and E_a = 61.07 kJ/mol.