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The effect of pressure deformation on dielectric and conducting properties of silicone rubber/polypyrrole composites in the percolation threshold region

Tipo de material: TextoTextoSeries ; Smart Materials and Structures, 14(5), p.949-952, 2005Trabajos contenidos:
  • Peliskova, M
  • Vilcakova, J
  • Omastova, M
  • Saha, P
  • Chunzhong, L
  • Otakar, Q
Recursos en línea: Resumen: The changes in the frequency dependences of the AC conductivity and complex permittivity during the pressure deformation of silicone rubber/polypyrrole composites have been examined. The experiments revealed that the pressure loading of the composite with particle concentration in the vicinity of the upper part of the percolation region causes disconnection of particle contacts and the transition of the semiconducting particle chain structure to a non-conducting composite structure corresponding to mutually insulated particles below the percolation threshold. A close relation between the frequency dependences of the conductivity and permittivity of the composites at various pressure loadings has been confirmed.
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The changes in the frequency dependences of the AC conductivity and complex permittivity during the pressure deformation of silicone rubber/polypyrrole composites have been examined. The experiments revealed that the pressure loading of the composite with particle concentration in the vicinity of the upper part of the percolation region causes disconnection of particle contacts and the transition of the semiconducting particle chain structure to a non-conducting composite structure corresponding to mutually insulated particles below the percolation threshold. A close relation between the frequency dependences of the conductivity and permittivity of the composites at various pressure loadings has been confirmed.

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