Corona Resistance of Direct Flourinated Epoxy/Al2O3 Nanocomposites

Abstract

Pure epoxy resin and epoxy/Al2O3nanocomposite sheets were prepared and directly fluorinated. The ATR-IR spectrum proves the existence of C-Fx groups in fluorinated samples. Dielectric permittivity increases because of Al2O3nanoparticles yet fluorination leads to decreasing of permittivity. Results of surface potential decay and surface morphology measurement indicate that combination of fluorination and nano filling significantly improves corona resistance of epoxy resin. Charge injection to sample matrix tends to be restrained by high surface conductivity of fluorinated layer, while nanoparticles may attenuate the mean kinetic energy of negative charge carriers that arriving sample surface, and increase the probability of charge being captured in matrix. In addition, the high bond energy of C-Fx groups and Al2O3nanoparticles may contributed to the improved resistance of epoxy resin to corona discharge.