Structural anisotropy and transport properties in sulfonated polyimide membranes [Anisotropie structurale et des propriétés de transport dans les membranes en polyimide sulfoné]

Olivier Diat (1) , J.-F. Blachot , A.-L. Rollet (2) , L. Rubatat (3) , C. Valois , M. Müller , G. Gebel (4)

1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
2 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques
3 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
4 SPRAM - UMR 5819 - Structures et propriétés d'architectures moléculaire

Anisotropic structure and transport properties were studied in sulfonated polyimide membranes using small-angle X-ray microscattering (microSAXS), pulse-field-gradient nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). Based on the MicroSAXS data, the in-plane structure appears to be isotropic while a significant anisotropy is observed along the thickness dimension. This result was confirmed by mechanical deformation experiments: SEM images of stretched and fractured specimens revealed a layered structure. The evolution of the ionic conductivity as a function of the ion content suggests the presence of anisotropic domains. The NMR determination of diffusion coefficients along the planar and thickness directions revealed a significant anisotropy, which confirmed the structure-transport relationships.

Domaines: Physique [physics]

Olivier Diat, J.-F. Blachot, A.-L. Rollet, L. Rubatat, C. Valois, et al. (Dir.). Structural anisotropy and transport properties in sulfonated polyimide membranes [Anisotropie structurale et des propriétés de transport dans les membranes en polyimide sulfoné]. 12 (2), pp.Pr263-Pr271, 2002. ⟨hal-01560408⟩