PTC Effect in Carbon Black-Filled Ethylene-Propylene-Diene Terpolymer Systems

摘要

The positive temperature coefficient (PTC) effects of carbon black (CB)-filled semicrystalline and amorphour ethylene-propylene-diene terpolymer(EPDM) composites were studiedThe semicrystalline EPDM/CB composite exhibited a low PTC effect followed by a pronounced negative temperature coefficient (NTC) effect,while the amorphous EPDM/CB composite exhibited only an NTC effect.By the effect of #gamma#-ray irradiation,not only was the NTC effect of the composites eliminated,but also a high PTC effect appeared.The PTC intensity eached as high as six orders of magnitude even for an amorphous EPDM/CB composite and the PTC transition temperature decreased with the irradiation dose.