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100 1 _ |a Auffarth, Sebastian
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245 _ _ |a Nanophase-Separated Block-co-Polymers Based on Phosphonated Pentafluorostyrene and Octylstyrene for Proton-Exchange Membranes
260 _ _ |a Washington, DC
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520 _ _ |a Nanophase 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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700 1 _ |a Wagner, Maximilian
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700 1 _ |a Krieger, Anja
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700 1 _ |a Fritsch, Birk
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700 1 _ |a Hager, Linus
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700 1 _ |a Hutzler, Andreas
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700 1 _ |a Böhm, Thomas
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700 1 _ |a Thiele, Simon
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700 1 _ |a Kerres, Jochen
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773 _ _ |a 10.1021/acsmaterialslett.3c00569
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