In this study,a novel type of methyl vinyl silicone rubber(VMQ)/multi-walled carbon nanotubes(MWCNT)composites were prepared by using an open-mill method,and the effects of MWCNT content on the dispersion,electri-cal conductivity and resistance-strain response of the composites were studied.The results indicated that MWCNT could be uniformly dispersed in VMQ at a certain amount to form a three-dimensional tunneling conductive network.This en-sures the composites obtained a low percolation threshold of 2.51 wt%,a large sensing range higher than 200%,and a high sensitivity with a gauge factor higher than 2 546.16).The composites also present a stable resistance response signal in the process of multiple cycles,especially showing an excellent resistance signal stability without any shoulder peaks dur-ing 4 000 cycles.Through the theoretical model analysis of tunnel effect,the resistance-strain response mechanism was discussed.The composites exhibit the potential of real-time strain monitoring for large deformation isolation bearings.
关键词
多壁碳纳米管/硅橡胶/电阻-应变响应/结构健康监测/智能传感材料
Key words
multi-walled carbon nanotube/silicone rubber/resistance-strain response/structural health monitoring/smart sensing composite
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