DC breakdown properties of interpenetrating polymer networks based on Epoxy/MA/PU

A series of interpenetrating polymer networks (IPN) based on Epoxy, MA and PU were synthesized in order to improve withstand voltage properties of Epoxy resin. Dielectric breakdown characteristics are investigated for six types of specimens. As a result, it was found that dielectric breakdown characteristic of SIN specimen was the most excellent. It was also found that SIN specimens were stronger than anything else in scanning electron microscopy. On the other hand, as a result of consideration of dielectric breakdown strength change according to adding filler, it was confirmed that the decrease of dielectric breakdown strength are controlled by IPN method