Abstract: The electric conduction mechanism of polymeric materials with positive temperature coefficient (PTC) was introduced. Recent development of epoxy resin-based PTC composites at home and abroad was summarized and factors affecting the PTC characteristics of the epoxy resin-based conductive composites were analyzed, including conductive fillers, epoxy matrix, the third matrix components, curing agent, curing temperature, and processing technology. At the same time, application and development direction of these materials were discussed.

Key words: epoxy resin, conductive composite, positive temperature coefficient (PTC) characteristic, influence factor