Oriented Morphology and Anisotropic Transport in Uniaxially Stretched Perfluorosulfonate Ionomer Membranes

Autor:	Louis A. Madsen, Gilles M. Divoux, Robert B. Moore, Jing Li, Jong Keun Park
Rok vydání:	2011
Předmět:	Water transport Materials science Polymers and Plastics Small-angle X-ray scattering Organic Chemistry Ionic bonding Conductivity Inorganic Chemistry chemistry.chemical_compound Crystallography Membrane chemistry Chemical physics Materials Chemistry Deformation (engineering) Anisotropy Ionomer
Zdroj:	Macromolecules. 44:5701-5710
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma200865p
Popis:	Relations between morphology and transport sensitively govern proton conductivity in perfluorsulfonate ionomers (PFSIs) and thus determine useful properties of these technologically important materials. In order to understand such relations, we have conducted a broad systematic study of H+-form PFSI membranes over a range of uniaxial extensions and water uptakes. On the basis of small-angle X-ray scattering (SAXS) and 2H NMR spectroscopy, uniaxial deformation induces a strong alignment of ionic domains along the stretching direction. We correlate ionic domain orientation to transport using pulsed-field-gradient 1H NMR measurements of water diffusion coefficients along the three orthogonal membrane directions. Intriguingly, we observe that uniaxial deformation enhances water transport in one direction (parallel-to-draw direction) while reducing it in the other two directions (two orthogonal directions relative to the stretching direction). We evaluate another important transport parameter, proton conductiv...
Databáze:	OpenAIRE
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