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Morphological studies and ionic transport properties of partially sulfonated diblock copolymers
Authors:Daniel Gromadzki  Miroslav Janata  Frédéric Nallet  Petr Štěpánek
Institution:a Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague, Czech Republic
b Centre de Recherches Paul Pascal, CNRS, 33 600 Pessac, France
c Structures et Propriétés d’Architectures, Moléculaires, UMR 5819 (CEA, CNRS, UJF), DRFMC/SPrAM, CEA Grenoble, 38054 Grenoble Cedex 9, France
Abstract:The morphological behavior of partially sulfonated polystyrene-block-poly(ethylene-alt-propylene) (PS-PEP) membranes cast from tetrahydrofuran (THF) solutions were investigated by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM).The uptakes of methanol and water increase as the sulfonation degree increases, the methanol uptake being overwhelmingly greater than the water uptake. The conductivity increases almost exponentially with increasing sulfonation degree of polystyrene units. Clusters of sulfonated units that are formed in the solution used for casting membranes persist in the solid state after evaporation. In contact with water, swelling of the membranes proceeds predominantly in these clusters. The original lamellar morphology of the diblock copolymer is progressively deformed with increasing degree of sulfonation by the presence of the clusters containing ion-rich sequences of sulfonated polystyrene blocks.
Keywords:Sulfonated polystyrene-block-hydrogenated polyisoprene  Ionomer  Morphology  Conductivity
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