Variations des caracteristiques dielectriques des resines epoxydes au cours de leur reticulation sous microondes

The dielectric loss factor of epoxy resin cured by amine is measured all along the curing, performed under a microwave field (2,45 GHz). A linear hypothesis based on the dielectric contributions of all known constituents allows to show a polar intermediate state; the formation of this state is reversible. An interpretation taking into account hydrogen bonds is proposed. The evolution of dielectric constants during curing brings evidences that microwaves are a peculiarly convenient means of energy transfer to chemical processes as cross‐linking reactions.