The dielectric properties of homogeneous solutions of amine-terminated butadiene acrylonitrile (ATBN) elastomer, diglycidyl ether of bisphenol-A and Ancamide have been measured during their curing at 298 and 373 K. As curing progresses, the dielectric permittivity, e', decreases and dielectric loss, e", first decreases and then peaks. The e' and e" of the cured thermosets increase with increase in the elastomer content but decrease with increase in the temperature of cure for the same elastomer content. The rate of curing becomes slower with increased amount of ATBN in the thermoset. A prominent relaxation process in the cured thermoset is the a-relaxation of the elastomer, whose height increases with increase in the elastomer content. The broad shoulder to the low-temperature side of the peak is due to the y- and//-relaxation processes of the epoxy. The dielectric properties of the thermosets are relatively insensitive to the inversion of the thermoset matrix to an elastomer matrix as the elastomer concentration is increased.
Посилання на статтю:
Relaxations in thermosets: 22. Curing kinetics and the dielectric properties of an elastomer containing epoxide cured with Ancarnide / M. Wang*, J. P. Szabot and G. P. Johari // Polymer. – 1992. – Vol 33. – P. 4951-4960.