Aromatic Copolymers Containing Ammonium-Functionalized Oligophenylene Moieties as Highly Anion Conductive Membranes

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• 作者：Naoki Yokota ; Manai Shimada ; Hideaki Ono ; Ryo Akiyama ; Eriko Nishino ; Koichiro Asazawa ; Junpei Miyake ; Masahiro Watanabe ; Kenji Miyatake
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：December 9, 2014
• 年：2014
• 卷：47
• 期：23
• 页码：8238-8246
• 全文大小：575K
• ISSN：1520-5835

文摘

The synthesis and properties of anion conductive aromatic copolymers containing oligophenylene moieties as a scaffold for quaternized ammonium groups are reported. Our new hydrophilic components consist of a chemically robust oligophenylene main chain modified with a high density of ionic groups. A partially fluorinated oligo(arylene ether) was employed as a hydrophobic block. The targeted copolymers (QPE-bl-9) were synthesized via nickel-mediated coupling polymerization, followed by chloromethylation, quaternization, and ion exchange reactions. QPE-bl-9 provided tough, bendable membranes by solution casting. The resulting membrane with the highest ion exchange capacity (IEC = 2.0 mequiv g^鈥?) exhibited high hydroxide ion conductivity (138 mS cm^鈥?) in water at 80 掳C. Reasonable alkaline stability of QPE-bl-9 membrane was confirmed in 1 M KOH aqueous solution for 1000 h at 40 掳C. A noble metal-free fuel cell with QPE-bl-9 used as the membrane and electrode binder was successfully operated. A maximum power density of 510 mW cm^鈥? was achieved at a current density of 1.20 A cm^鈥? with hydrazine as the fuel and O₂ as the oxidant.