Conduction mechanism in H-type polysiloxane-polypyrrole block copolymers

Abstract

Conducting polymers of polysiloxane-polypyrrole were synthesized by electropolymerization of the pyrrole monomer through pyrrole moieties in N-pyrrole-terminated polysiloxanes. Sodium paratoluene sulfonate was used as the electrolyte. Scanning electron microscopy (SEM) was used to determine the surface morphology of the films. The room-temperature conductivity values of the films were found to be in the range of 1.9-4.4 × 10-4 (Ω cm)-1, depending on the supporting electrolyte concentration. The temperature dependence of the dc conductivities of the copolymers having different dopant concentrations was investigated within the temperature range of 100-320 K. The evaluated parameters showed that the electrical transport is dominated by variable range hopping.