ABSTRACT
Exercise Questions .........................................................................................................................125 References ...................................................................................................................................... 125
Abstract The electrical properties of conjugated polymers such as doped polyaniline and doped polypyrrole vary widely depending on their synthesis and processing route, doping level, etc. The variety demonstrates itself in the strong frequency and temperature dependencies of conductivity. These dependencies refl ect the low dimensionality of a conducting network in the polymers. The network is formed by fast intrachain diffusion and rare interchain hops of charge carriers. Depending on polymer morphology the network is modeled by a quasi-onedimensional system of randomly coupled chains or a fractal chain with dimensionality 1 + s. We briefl y discuss the experimental results for dielectric constant and conductivity in poorly conducting polymers. To describe the properties of doped polymers in the metallic state, we use the models of chain-linked granular metal.
