After some recalls on the dielectric behavior of the organic materials, a parametrical study of the activation by continuous microwaves (2 450 MHz) of the curing reaction of an epoxy resin of DGEBA type in presence of diamino‐biphenyl‐methane used as crosslinking agent, is carefully described. The recording during the irradiation of the variations of the average temperature of the chemical medium and of the associated dielectric loss on the one hand, and the determination of the glassy transition temperature of the final networks on the other hand, allows optimization procedures of the electromagnetic treatment of the initial prepolymeric mixtures.

Radiofrequency (27.12 MHz) heating is used for the activation of the curing reaction of an epoxy resin of DGEBAa) type in presence of diaminodiphenylmethane as crosslinking agent. The principle of the activation process is based on the partial conversion as heat of the dielectric loss in the organic medium due to the forced dipolar relaxation at 27.12 MHz. The samples of thermosetting matter are positioned between two parallel steel plates or electrodes, and an electrical voltage is applied. When the temperature is sufficiently high, the step‐growth reactions starts working.

The crosslinking reaction of a divinylester resin of epoxy-acrylic type in styrene solution is activated by high frequencies at 27.12 MHz. The samples to be cured are positionned betweeen two parallel steel plates used as electrodes and an electrical voltage is applied. A parametrical study is described, where the applied electrical voltage, or power, and the concentration of benzoyl peroxide, which is the radical initiator, are taken into account. The optimization of the electromagnetic curing is performed through the determination of the glassy transition temperature of the final products.