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PFG-NMR and SANS studies in cation exchange membranes based on sulfonated polyphenylene multiblock copolymers

Yoshida, Miru*; Zhao, Y.; Fujita, Masahiro*; Ohira, Akihiro*; Takeoka, Yuko*; Koizumi, Satoshi*; Rikukawa, Masahiro*

We employed the pulsed field gradient nuclear magnetic resonance (PFG-NMR) technique to investigate the self-diffusion coefficient of water, $$D$$$$_{rm NMR}$$, in newly designed cation exchange membranes, made of sulfonated poly($$p$$-phenylene)-poly(ether ketone) multiblock copolymers, which are denoted by S-6H ($$n$$) $$x$$:$$y$$. The $$D$$$$_{rm NMR}$$ value was measured as a function of the gradient strength, g, from 0.1 to 11.0 T/m. S-6H (14) 1:1 showed the $$D$$$$_{rm NMR}$$ value about 10 times lower than the value in bulk liquid water. Small angle neutron scattering (SANS) measurements showed two peaks in S-6H (14) 1:1. The low $$q$$ peak is attributed to the formation of microdomains and the high $$q$$ peak is due to the formation of ionic clusters in the swollen microdomains.

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