Dielectric monitoring of epoxy cure

摘要: The cure process of mixtures a DGEBA-type epoxy resin and ethylenediamine, in different molar ratios, was investigated by dielectrometry wide frequency range, 103-2·1010 Hz, at three temperatures, 25, 60, 70°C. Two relaxation processes were found whose relevant parameters obtained proper fit procedure. A deeper knowledge quantitative description the observed effects achieved analyzing change dielectric data caused chemical reaction. strength both processes, as well other parameters, reflect modifications system; permittivity, static microwave frequencies, linearly related to conversion. These results support interpretative model based on disappearance dipoles, confirm permittivity valuable quantity monitor kinetics © 1996 John Wiley & Sons, Inc.