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Variations des caracteristiques dielectriques des resines epoxydes au cours de leur reticulation sous microondes
Author(s) -
Delmotte Michel,
Jullien Henri
Publication year - 1987
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19870090120
Subject(s) - dielectric , epoxy , curing (chemistry) , polymer chemistry , materials science , microwave , permittivity , chemistry , thermodynamics , composite material , physics , optoelectronics , quantum mechanics
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.