CNF/柔軟エポキシ複合材料のひずみに伴う電気抵抗変化

概要

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Carbon nanofiller (CNF) has good electrical conductivity. Addition of a few percentages of carbon nanofillers to polymer yields electrical conductivity but hardly affects the mechanical properties of polymer. This conductive polymer may be useful for sensing applications such as strain sensors and chem-resist sensors. Many researchers have reported on the electrical conductivity, but the electrical resistance change under strain of the carbon nanofiller composites is not fully investigated. In this study, the electrical resistance change under strain of CNF/flexible-epoxy composites was investigated experimentally and analytically. Experimental results show that the electrical resistance change under strain is nonlinear and much larger than that in metal, and the electrical resistance change rate decreases as increasing the weight fraction of CNF. The mechanism of the electrical resistance change under strain of CNF/polymer composites was discussed by using electrical circuit simulation based on a percolation network model and tunneling effect between CNFs. The results imply that the nonlinear behavior is caused by the combination of tunneling effect between CNFs and the change of the conductive network, and that the decrease of the electrical resistance change rate with increase of the weight fraction of CNF is caused by the nature of the percolation network.
日本複合材料学会の論文
2007-05-15