Abstract
A new strain measurement method has been developed by applying the highly sensitive change of electronic conductivity of CNTs. The authors dispersed the CNTs in polyisoprene and polycarbonate, and the volumetric concentration of CNT was about 6.0% and 11.5%, respectively. An uni-axial strain was applied to the CNT-dispersed resins, and the change of the electrical resistance was measured. The electrical resistance of CNT-dispersed polyisoprene increased monotonically with the increase of the applied strain, and that of CNT-dispersed polycarbonate also changed almost linearly. In addition, the change of atomic distance of the CNT under an uni-axial strain was analyzed by applying the molecular dynamics method. It was estimated that the local deformation of six membered-rings in the CNT caused the drastic change of resistance.
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