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Branched and Cross‐Linked Proton Conductive Poly(arylene ether sulfone) Ionomers: Synthesis and Properties
Author(s) -
Chikashige Yohei,
Chikyu Yoshiki,
Miyatake Kenji,
Watanabe Masahiro
Publication year - 2006
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600077
Subject(s) - arylene , sulfone , ether , ionomer , polymer chemistry , thermal stability , membrane , materials science , chemistry , polymer , organic chemistry , copolymer , aryl , biochemistry , alkyl
Summary: A series of branched and cross‐linked poly(arylene ether sulfone) ionomers containing sulfofluorenyl groups, 2b–e were synthesized in order to investigate the effect of these chemical modifications on the properties. Ionomers 2b–e gave a flexible, ductile, and transparent membrane by casting from DMAc solution. The branching and cross‐linking were effective to improve the dimensional stability under wet conditions without losing their high thermal, oxidative, and hydrolytic stability. The cross‐linked ionomer 2e (IEC = 2.63 meq · g −1 ) membrane showed high proton conductivity of 0.2 S · cm −1 at 87% RH and 0.02 S · cm −1 at 57% RH. The branched ionomer 2b membrane was durable in proton conductivity for almost 2 months without any chemical degradation.Chemical structure of branched and cross‐linked poly(arylene ether sulfone) ionomers.