Dielectric relaxation in epoxide resins hardened with different anhydrides

Abstract Hardened epoxides contain polar bonds with orientational polarization; this can be used in an electric field to assess molecular mobility. The parts of the chains containing the anhydride grouping in polymers hardened with anhydrides have an ester group, while the polymer contributes hydroxyl and ether bonds to the epoxy system. The different types and conditions of internal rotation of these groups permit the assumption of specificity of the relaxation parameters of their dipolar polarization; this again makes it possible to study the structural mobility of these parts. This report describes the study of the dipolar polarization relaxation of group and segmental type on the low mol.wt. oligomer diane, † to get some knowledge of the mechanism of relaxation and its connection with the structure of the setting agent used, which was an acid anhydride or an amine complex with boron trifluoride acting as a setting catalyst.