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Nano-meso scale structures of radiation-grafted polymer electrolyte membranes investigated by small angle neutron scattering technique

Sawada, Shinichi; Yamaguchi, Daisuke; Putra, A.; Koizumi, Satoshi; Maekawa, Yasunari

In order to develop the novel polymer electrolyte membranes (PEMs) with high performances, it is important to clarify the structures of conventional PEMs. In this study, we investigated the structures of the radiation grafted PEMs based on poly(ethylene-co-tetrafluoroethylene) (ETFE) films by a small angle neutron scattering (SANS) technique. From the SANS profile, the shoulder peak was observed at the wave number q$$_{P}$$=0.16nm$$^{-1}$$. This result suggest that the domains containing poly(styrene sulfonic acid) (PSSA) graft chains should exist at constant intervals, corresponding to the correlation distance L$$_{P}$$=2$$pi$$/q=39 nm. The distance of ETFE lamellar stacks was reported to 27 nm, which is somewhat close to L$$_{P}$$. This indicates that the PSSA graft chains were introduced in the interfacial regions in lamellar stacks.

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