TY  - JOUR
AU  - Hamada, Takashi
AU  - Yoshimura, Kimio
AU  - Takeuchi, Kota
AU  - Watanabe, Shun
AU  - Zhao, Yue
AU  - Hiroki, Akihiro
AU  - Hagiwara, Tokio
AU  - Shishitani, Hideyuki
AU  - Yamaguchi, Susumu
AU  - Tanaka, Hirohisa
AU  - Radulescu, Aurel
AU  - Ohwada, Kenji
AU  - Maekawa, Yasunari
TI  - Synthesis and Characterization of 4‐Vinylimidazolium/Styrene‐Cografted Anion‐Conducting Electrolyte Membranes
JO  - Macromolecular chemistry and physics
VL  - 222
IS  - 11
SN  - 1521-3935
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-02552
SP  - 2100028
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000645651500001
DO  - DOI:10.1002/macp.202100028
UR  - https://juser.fz-juelich.de/record/893093
ER  -