Effects of space charge on electrical insulating properties of modified epoxy resin system by reactive nitrile-additives

The effects of space charge on insulating properties of modified epoxy resin system DGEBA/MDA/SN was studied by using DSC and TSC. Three characteristic TSC peaks in the temperature range from -150 to 250/spl deg/C, consisting of a /spl beta/ peak at 162.1/spl deg/C and /spl gamma/ and /spl delta/ below zero, were observed. T/sub p/ moved towards lower temperature with increasing SN contents. Space charge accumulated and impurities changes the initiates the electrical treeing.