期刊
JOURNAL OF MEMBRANE SCIENCE
卷 214, 期 1, 页码 31-42出版社
ELSEVIER
DOI: 10.1016/S0376-7388(02)00522-7
关键词
sulfonated polyimides; anisotropy; micro-SAXS; electron microscopy; conductivity; pulse field gradient NMR
An original analysis of the structure of ionomer films along the three dimensions using micro small-angle X-ray scattering (microSAXS) technique is reported. While the in-plane structure appeared as isotropic, a significant SAXS anisotropy was observed in the transverse direction, revealing a multiscale structural anisotropy from the molecular level to several tens of nanometers. Using transmission and scanning electron microscopy (TEM and SEM, respectively), a layered structure was identified up to micrometer scales. This structural anisotropy was used to interpret the conductivity data as a function of the ion content. Moreover, the diffusion coefficients of the counterions, were determined along the planar and transverse directions using pulse field gradient spin echo-NMR (PFGSE-NMR) in order to correlate structure and transport properties. (C) 2002 Elsevier Science B.V. All rights reserved.
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