%0 Journal Article
%A Hamada, Takashi
%A Yoshimura, Kimio
%A Takeuchi, Kota
%A Watanabe, Shun
%A Zhao, Yue
%A Hiroki, Akihiro
%A Hagiwara, Tokio
%A Shishitani, Hideyuki
%A Yamaguchi, Susumu
%A Tanaka, Hirohisa
%A Radulescu, Aurel
%A Ohwada, Kenji
%A Maekawa, Yasunari
%T Synthesis and Characterization of 4‐Vinylimidazolium/Styrene‐Cografted Anion‐Conducting Electrolyte Membranes
%J Macromolecular chemistry and physics
%V 222
%N 11
%@ 1521-3935
%C Weinheim
%I Wiley-VCH
%M FZJ-2021-02552
%P 2100028
%D 2021
%X The β-hydrogen-free imidazole monomer, 2-methyl-N-methyl-4(5)-vinylimidazole (2M4VIm), is synthesized to prepare anion exchange membranes (AEMs). The radiation-induced graft polymerization of 2M4VIm and styrene is performed in poly(ethylene-co-tetrafluoroethylene), followed by N-alkylation and ion exchange reactions to prepare 4-vinylimidazolium-containing AEM (2M4VIm/St-AEM). AEMs that have a 6/4 2M4VIm/St molar ratio and 1.7 mmol g−1 ion exchange capacity (IEC) result in 75 mS cm−1 conductivity and 60% water uptake at room temperature in water, demonstrating enhanced values compared to previously reported 2-methyl-N-vinylimidazolium-containing AEMs (2MNVIm/St-AEM) that have a similar comonomer ratio and IEC. The small-angle neutron scattering measurements of dry and swollen 2M4VIm/St-AEM reveal hydrophilic/hydrophobic two-phase separation, as observed for 2MNVIm/St-AEM with a similar Im/St composition. 2M4VIm/St-AEMs exhibit higher alkaline stability in 1 m KOH at 80 °C at an early stage owing to the suppression of imidazolium β-elimination but lower long-term stability than that of 2MNVIm/St-AEM due to the ring-opening reaction of the imidazolium group due to its outward orientation from the graft main chain.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000645651500001
%R 10.1002/macp.202100028
%U https://juser.fz-juelich.de/record/893093