Abstract
Carbon nanotube (CNT) filled silicone rubber (SR) composites were synthesized by in situ polymerization. The effect of strain on the electrical resistance of the CNT/SR composites and the structure evolution of CNT networks during tensile deformation were investigated. The results showed that the CNT/SR composites had high sensitivity of resistance-strain response. In a wide strain range (0-125%), the change of resistivity could reach 107, which was closely associated with the evolution process of the conductive CNT-network structure. The volume expansion of the composites in the tensile process led to a gradual decrease in the volume fraction of CNTs with the strain increase. When CNT loading was lower than the percolation threshold, CNT network was in disconnected state with a rapid increase in electrical resistance of the composites. Furthermore, the CNT loading had remarkable effect on the sensitivity of resistance-strain response in the composites.
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