Synthesis and properties of sulfonated block copolymers having fluorenyl groups for fuel-cell applications

Byungchan Bae, Kenji Miyatake*, Masahiro Watanabe

*この研究の対応する著者

研究成果: Article査読

91 被引用数 (Scopus)

抄録

A series of sulfonated poly(arylene ether sulfone)s (SPEs) block copolymers containing fluorenyl groups were synthesized. Bis(4-fluorophenyl)sulfone (FPS) and 2,2-bis(4-hydroxy-3,5-dimethylpheny)propane were used as comonomers for hydrophobic blocks, whereas FPS and 9,9-bis(4-hydroxyphenyl)fluorene were used as hydrophilic blocks. Sulfonation with chlorosulfonic acid gave sulfonated block copolymers with molecular weight (M w) higher than 150 kDa. Proton conductivity of the SPE block copolymer with the ion exchange capacity (IEC) = 2.20 mequiv/g was 0.14 S/cm [80% relative humidity (RH)] and 0.02 S/cm (40% RH) at 80 °C, which is higher or comparable to that of a perfluorinated ionomer (Nafion) membrane. The longer hydrophilic and hydrophobic blocks resulted in higher water uptake and higher proton conductivity. Scanning transmission electron microscopy observation revealed that phase separation of the SPE block copolymers was more pronounced than that of the SPE random copolymers. The SPE block copolymer membranes showed higher mechanical properties than those of the random ones. With these properties, the SPE block copolymer membranes seem promising for fuel-cell applications.

本文言語English
ページ(範囲)1279-1286
ページ数8
ジャーナルACS Applied Materials and Interfaces
1
6
DOI
出版ステータスPublished - 2009 6 24
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)

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