Abstract
AbstractA novel NiTi/vapor grown carbon fiber (VGCF)/polydimethylsiloxane flexible film is successfully prepared, of which the resistivity can keep stable under various strain deformation. By introducing NiTi particles with appropriate phase transition temperature, the resistivity change value of the composite in the temperature range can be doubled without affecting the flexibility of the composite. A computer simulation based on percolation network (PN) theory and Monte Carlo (MC) calculation is developed to understand the mechanisms of resistivity temperature curves. The simulation results agree with experiments quantitatively, which reveal that the inhomogeneous martensitic transformation of NiTi particles is a dominant mechanism for the enlarged and nonlinearity resistivity temperature variation of the composite. Parametric studies have been conducted and the calculation results show that selecting NiTi particles with smaller particle diameter, VGCF with higher conductivity, and polymer with larger coefficient of thermal expansion is conducive to further obtain flexible composite films with better temperature sensitivity.
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