Nafion in Dilute Solvent Systems: Dispersion or Solution?

The morphology of Nafion (EW = 1000, Na+ form) in dilute solvents is investigated using small angle neutron scattering (SANS) and 19F NMR. SANS modeling indicates three types of particle morphology: (i) a well-defined cylindrical dispersion in glycerol and in ethylene glycol with different degrees o...

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Published in:ACS macro letters 2012-12, Vol.1 (12), p.1403-1407
Main Authors: Welch, Cynthia, Labouriau, Andrea, Hjelm, Rex, Orler, Bruce, Johnston, Christina, Kim, Yu Seung
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description The morphology of Nafion (EW = 1000, Na+ form) in dilute solvents is investigated using small angle neutron scattering (SANS) and 19F NMR. SANS modeling indicates three types of particle morphology: (i) a well-defined cylindrical dispersion in glycerol and in ethylene glycol with different degrees of solvent penetration; (ii) a less-defined, highly solvated large particle (>200 nm) in water/isopropanol mixtures; and (iii) a random-coil conformation (true solution behavior) in N-methylpyrrolidone. These distinct morphological characteristics of Nafion are consistent with the main and side chain mobilities measured by 19F NMR.
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title Nafion in Dilute Solvent Systems: Dispersion or Solution?
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