Abstract: In this paper， the effects of the silica reinforcing material and coupling agent on the mechanical properties of conductive rubbers were investigated. The experiment results indicated that the addition of the silica reinforcing material and coupling agent could enhance the mechanical properties of conductive rubbers effectively， but there was little influence on their conductance. The conductive rubbers obtained optimal mechanical performance at a silica content of 15 wt% and a coupling-agent content of 0.7 wt%. In addition， the adaptability of conductive rubbers in high-temperature environments was evaluated. The results indicated that the conductive rubbers kept relatively stable mechanical properties and electrical conductance within 96 hours in high-temperature environments.

Key words: conductive rubber, coupling agent, silica, mechanical property