KINETICS OF DICHLOROMETHANE ABSORPTION INTO THE CONDUCTIVE POLYMERS POLY(N-METHYLPYRROLE) AND POLY(N-METHYLPYRROLE POLYSTYRENESULFONATE)/

Mass transients have been measured for the sorption of dichloromethane from aqueous/electrolyte solution into the organic conductive polymer s poly(N-methylpyrrole-ClO4) and poly(N-methylpyrrole-polystyrene-sulf onate). The data are analysed within the context of two sorption model s: pseudo-first-order kinetics for single-site adsorption and diffusio n-limited absorption in an infinite plane sheet. Rate constants and ap parent diffusion coefficients for absorption differ by a factor of 2 f or oxidized and reduced poly(N-methylpyrrole-ClO4) but are very simila r for the two oxidation forms of poly(N-methylpyrrole-polystyrenesulfo nate). These observations; are discussed in terms of the relative hydr ophobicities of the oxidized and reduced forms of each polymer. A deta iled study of the sorption rate constant vs film thickness reveals inf ormation on the rate-limiting step in the absorption process.