Relaxational properties and structure of compositions based on an epoxy resin modified with monoepoxide esters of fatty acids

Abstract

A relationship has been found between the position of dielectric loss peaks and the structure of epoxy polymers modified with monoepoxide esters, i.e. with products of epoxy oligomer esterification with fatty acids. It is shown that phase separation accounts for a second peak appearing in epoxy-epoxide ester polymers in the region for α relation. Parameters of dipole-segmental processes have been determined for structural elements of the studied systems. It was found that a lengthening of the fatty acid radical in the additive molecule leads to increased segmental mobility and to a fall in the glass-transition temperature. © 1988.