Transport,and thermodynamic investigations on sodium polystyrenesulfonate in ethylene glycol–water media |
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| Institution: | 1. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia;2. Charles University in Prague, Faculty of Science, Department of Physical and Macromolecular Chemistry, Hlavova 8, CZ-12840 Prague 2, Czech Republic;3. National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia;1. Fraunhofer-Institut für Biomedizintechnik (IBMT), Am Mühlenberg 13, D-14476 Potsdam–Golm, Germany;2. Stranski-Laboratorium für Physikalische und Theoretische Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany;1. Colloid Chemistry Laboratory, “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independenţei, 060021 Bucharest, Romania;2. Electrochemistry and Corrosion Laboratory, “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independenţei, 060021 Bucharest, Romania |
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| Abstract: | Polyion–counterion interactions in sodium polystyrenesulfonate dissolved in (ethylene glycol + water) mixed solvent media have been investigated conductometrically with special reference to their variations as functions of polyelectrolyte concentration, relative permittivity and temperature. Manning counterion condensation theory for polyelectrolyte solutions failed to describe the present experimental results. The data have, therefore, been analyzed using a new model for semidilute polyelectrolyte conductivity which takes into account the scaling arguments proposed by Dobrynin et al. The fractions of uncondensed counterions were found to depend on the polyelectrolyte concentration varying from 0.27 to 0.37, within the concentration range investigated here, indicating a strong interaction between counterions and polyion. A considerable fraction of the counterions is shown to migrate in the same direction as the polyions. The results further demonstrate that the monomer units experience more frictional resistance in solutions as the ethylene glycol content of the mixture increases or as the temperature decreases. |
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| Keywords: | Ethylene glycol–water mixed solvent media Sodium polystyrenesulfonate Conductivity Fractions of uncondensed counterions Colby model |
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