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

Autor:	Koichiro Asazawa, Ryo Akiyama, Hideaki Ono, Eriko Nishino, Manai Shimada, Masahiro Watanabe, Junpei Miyake, Naoki Yokota, Kenji Miyatake
Rok vydání:	2014
Předmět:	Aqueous solution Polymers and Plastics Ion exchange Organic Chemistry Arylene Ether Inorganic Chemistry chemistry.chemical_compound Membrane chemistry Polymerization Polymer chemistry Materials Chemistry Copolymer Hydroxide
Zdroj:	Macromolecules. 47:8238-8246
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma5019878
Popis:	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–1) exhibited high hydroxide ion conductivity (138 mS cm–1) in water at 80 °C. Reasonable alkaline stability of QPE-bl-9 membrane was confirmed in 1 M KOH aqueous solution for 1000 h at 40 °C. A noble metal-free fuel cell with QPE-bl-9 used as the membrane and electrode binder was successfully operated. A maximum power d...
Databáze:	OpenAIRE
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