Dielectric properties of underwater polystyrene films related to microcapsules.

概要

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Dielectric measurements were carried out on polystyrene films immersed in various kinds of electrolyte aqueous solutions. The observed dielectric relaxations were of the Debye type which was characteristic of the series combination of the polystyrene film and the ambient aqueous solution. Approximate formulas were derived of the dielectric theory of interfacial polarization for the bilamellar structure under the condition that the capacitance is much larger for the film than for the aqueous solution. Capacitance and conductance of the underwater film were evaluated from the dielectric observations by use of these approximate formulas. The film capacitance remained unchanged irrespective of the tonic species and the concentration of electrolyte solutions used, being inversely proportional to the thickness of the films. The relative permittivity of the polystyrene films was estimated to be 2.65. The ratio of the film conductivity to the solution conductivity for the same film was unaffected by the change in the concentration of electrolyte solutions, being in the order of 10<SUP>-4</SUP>. These features of the film capacitance and the conductivity ratio suggest that micropores in the film filled with the ambient electrolyte solutions are responsible for the electric conduction of the present underwater films.
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