Time evolution of dielectric parameters during the crosslinking of epoxy resins

The d.c. conductivity and the dielectric constant of an epoxy resin cured with a diamine were examined in a frequency interval extended up to 10^10 Hz. The analysis of the dielectric behavior has permitted gaining a better knowledge of the relationships between dielectric parameters and the physical and chemical modifications of the systems. The results indicate that the chemical kinetics of the crosslink process is closely paralleled by the change in time of the dielectric parameters so that dielectrometry provides valuable information on conversion, relaxation times, glass transition temperature and gelation