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Contrast Variation Small-Angle Neutron Scattering Study on Morphology of Polymer Electrolyte Membranes

Zhao, Y.; Koizumi, Satoshi; Rikukawa, Masahiro*; Yoshida, Miru*

We investigate the morphologies of a newly designed hydrocarbonate polymer electrolyte membrane (PEM), and commercial PEM Nafion. Two scattering maximums were observed for both materials at low q and high q regions for wet membranes, where q is a magnitude of scattering vector. The low q maximum is attributed to the formation of microdomain upon either swelling or crystallites, whereas the high q maximum is due to the formation of ionic clusters. The mesoscale and microscale structures could be elucidated by the contrast variation neutron scattering technique.

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