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001008906 1001_ $$0P:(DE-Juel1)185797$$aAuffarth, Sebastian$$b0$$eCorresponding author
001008906 245__ $$aNanophase-Separated Block-co-Polymers Based on Phosphonated Pentafluorostyrene and Octylstyrene for Proton-Exchange Membranes
001008906 260__ $$aWashington, DC$$bACS Publications$$c2023
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001008906 520__ $$aNanophase separation into hydrophobic and hydrophilic domains in commercial perfluorosulfonic acid polymers promotes high conductivity by forming proton-conductive channels within a matrix. To transfer this beneficial phase separation to phosphonic acid functionalized ionomers, we combine phosphonated polypentafluorostyrene and flexible polyoctylstyrene in a di-block-co-polymer. We introduce a stepwise approach, including mesophase simulations, synthesis, and spectroscopic imaging. After the required block lengths were calculated, controlled radical polymerization led to a narrowly distributed block-co-polymer. The respective block-co-polymer membrane outperforms a phosphonated pentafluorostyrene blend concerning conductivity and water uptake. Stained membrane cross-sections revealed bicontinuous nanophase separation in the 13 to 25 nm range in transmission electron microscopy. The ion-conducting phosphonated polymer block assembled into an isotropic, three-dimensional gyroidal network across the membrane. Our stepwise approach is transferable toward other block-co-polymer systems featuring different monomers or functional groups. Applying the proposed principles allows for the prediction of structure-related phase separation while reducing the amount of synthesis work.
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001008906 7001_ $$0P:(DE-Juel1)185079$$aWagner, Maximilian$$b1$$ufzj
001008906 7001_ $$0P:(DE-Juel1)189084$$aKrieger, Anja$$b2$$ufzj
001008906 7001_ $$0P:(DE-Juel1)195817$$aFritsch, Birk$$b3
001008906 7001_ $$0P:(DE-Juel1)189087$$aHager, Linus$$b4$$ufzj
001008906 7001_ $$0P:(DE-Juel1)188455$$aHutzler, Andreas$$b5
001008906 7001_ $$0P:(DE-Juel1)177694$$aBöhm, Thomas$$b6
001008906 7001_ $$0P:(DE-Juel1)165381$$aThiele, Simon$$b7
001008906 7001_ $$0P:(DE-Juel1)178950$$aKerres, Jochen$$b8$$eCorresponding author$$ufzj
001008906 773__ $$0PERI:(DE-600)3004109-0$$a10.1021/acsmaterialslett.3c00569$$gp. 2039 - 2046$$p2039 - 2046$$tACS materials letters$$v5$$x2639-4979$$y2023
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