Abstract
Dielectric observations were carried out on poly (methyl methacrylate) films immersed in aqueous KCl solutions of different concentrations. Relative permittivity and electrical conductivity of the film and those of the KCl solution phase were evaluated on the basis of a theory of interfacial polarization for a series combination model composed of a film and a KCl solution phase. Frequency dependence of the permittivity and the conductivity of the underwater film was approximated by a dielectric relaxation of the m-th power type. The permittivity and the conductivity of the underwater film were larger than those of a dry film measured in air. The permittivity of the underwater film was unaffected by the KCl concentration in the solution phase. The dc conductivity of the underwater films varied in proportion to the conductivity of the solution phase, being smaller than the conductivity of the solution phase by a factor of 2 × 10-5.
