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Dielectric analysis for the System Composed of Polystyrene Membrane Interfused with Polypyrrole Particle and Electrolyte SolutionsInfluence of Species and Concentration of the Electrolyte Solutions to the Permeability of the Membrane

LU Qing, ZHAO Kong-Shuang*, ZHAO Fang, JIA Jing-Jin   

  1. College of Chemistry, Beijing Normal University, Beijing 100875, China
  • Received:2008-07-10 Revised:1900-01-01 Online:2009-01-10 Published:2009-01-10
  • Contact: ZHAO Kong-Shuang

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Abstract: Dielectric measurements were carried out for polypyrrole(PPy)/polystyrene(PS) composite membrane immersed in different concentration of NaCl, KCl, CaCl2 and MgCl2 electrolyte solutions over a frequency range from 40 Hz to 11 MHz, two relaxations were observed. The dielectric relaxation mechanism was explained by the dielectric theories based on Maxwell-Wagner polarization relaxation, the system was modelled and the phase parameters were calculated via Hanais method. From the dielectric parameters, we discussed the electric property and the selectivity to different ions in the electrolyte solutions of the membrane in detail. Futher more, we acquired parameters of the membrane such as its concentration of the fixed charge. Valuable results of the ion permeability of PPy/PS membrane were obtained.

Key words: Dielectric spectrum, PPy/PS composite membrane, Donnan equilibrium, Ion permeability

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