Electret and Strength Properties of Polymeric Materials Based on Epoxy Oligomer and Amine Curing Agents

Resumo

Electret properties of polymeric materials based on DER-331 epoxy oligomer and amine curing agents, produced in the course of synthesis of the polymer in a constant electric field, were examined. It was shown that the presence of certain polar functional groups and fragments in the structure of the curing agent can both raise the electret characteristics of polymers (by making larger the number of polar groups capable of orientation) and diminish these characteristics (due to steric factors). To obtain polymeric epoxy materials possessing good electret characteristics, it is preferable to use diethylenetriamine as the amine curing agent. The hardness of epoxy polymers is determined by parameters of the network of chemical bonds and by their structural organization. Using N-aminoethylpiperazine in manufacturing polymeric materials based on the epoxy oligomer makes it possible to obtain 3D structures providing a higher hardness owing to the presence of a heterocyclic fragment in the structure of the curing agent. Converting the network polymeric structures to the polarized state results in hardness increases. This is due to the orientation of polar groups, which gives rise to a denser network of physical bonds.