A STUDY OF REACTION-KINETICS BY NEAR-INFRARED SPECTROSCOPY .2. COMPARISON WITH DIELECTRIC-SPECTROSCOPY OF MODEL AND MULTIFUNCTIONAL EPOXY AMINE SYSTEMS/

An investigation of the kinetics of two non-polymer-forming epoxy/amin e model systems and a polymer-forming multifunctional epoxy/amine form ulation was carried out by dielectric and near-infrared (near-IR) spec troscopy. Dielectric measurements were performed in the frequency rang e where polarization by charge migration is the dominant mechanism and the extent of reaction was calculated from the measured variation in impedance during reactions. Near-IR spectroscopy was carried out in th e frequency range between 7100 and 4000 cm(-1), and the extent of reac tion was evaluated from the changes in the characteristic absorption p eaks. Kinetic results determined by dielectric and near-IR spectroscop y were in excellent agreement for all systems investigated.