Quadrupolar interaction study of various cations confined in porous charged polymer film of sPI ionomers |
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Authors: | Rollet Anne-Laure Porion Patrice Delville Alfred Diat Olivier Gebel Gérard |
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Institution: | Centre de Recherche sur les Matériaux à Haute Température, CNRS, UPR 4212, 45071 Orléans cedex 02, France. |
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Abstract: | The structure of a sulfonated polyimide (sPI) ionomer membranes was investigated via the transport properties of various confined cations (7Li+, 23Na+, 87Rb+, 133Cs+). Their NMR spectra show large residual quadrupolar splitting depending on the orientation of the film in the static magnetic field B0. This behavior is the fingerprint of a macroscopic nematic ordering of charged interfaces. This is also confirmed by the anisotropy of the self-diffusion tensor measured by 1H and 7Li PGSE experiments on N(CH3)4+ and Li+ cations, respectively. |
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