title: Characterization of porous structure through the dynamical properties of ions confined in sulfonated polyimide ionomers films.
abstract: The structure of sulfonated PolyImide (sPI) ionomer membrane has been investigated via the transport properties of ions confined inside. Transport coefficients of N(CH(3))(4)(+) and Na(+) ions have been determined by several techniques in order to get a range of time/space scale as wide as possible: a method using radiotracers, conductivity, pulsed field gradient NMR and NMR quadrupolar relaxation rates determination. For N(CH(3))(4)(+), the self-diffusion has been measured in the direction of membrane plan (parallel) and in the perpendicular direction (transverse), whereas for Na(+) only transverse self-diffusion has been measured. The conductivity of both ions has been measured in the transverse direction. The results show a anisotropic and multiscale structure with a separation phase between hydrophilic and hydrophobic domains that is not well-defined.
authors.affiliation: Centre de Recherche sur les Matériaux à Hautes Températures, CNRS UPR4212, 1D avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France. rollet@cnrs-orleans.fr
authors.forename: A-L
authors.initials: AL
authors.lastname: Rollet
authors.forename: J-F
authors.initials: JF
authors.lastname: Blachot
authors.forename: A
authors.initials: A
authors.lastname: Delville
authors.forename: O
authors.initials: O
authors.lastname: Diat
authors.forename: A
authors.initials: A
authors.lastname: Guillermo
authors.forename: P
authors.initials: P
authors.lastname: Porion
authors.forename: L
authors.initials: L
authors.lastname: Rubatat
authors.forename: G
authors.initials: G
authors.lastname: Gebel