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Effect of addition of organic microspheres on proton conductivity property of sulfonated poly(arylene ether sulfone) membrane
Author(s) -
Liang Cui,
Nagami Chika,
Maruyama Tatsuo,
Sotani Tomohiro,
Matsuyama Hideto
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28619
Subject(s) - arylene , polymer chemistry , sulfonic acid , membrane , materials science , ether , polystyrene , sulfone , emulsion polymerization , proton exchange membrane fuel cell , methanol , chemical engineering , nuclear chemistry , polymerization , chemistry , polymer , composite material , organic chemistry , aryl , biochemistry , alkyl , engineering
Sulfonated poly(arylene ether sulfone) (SPAES)/polystyrene(PS) and SPAES/polystyrene sulfonic acid (PSSA) composite membranes were studied for a proton‐exchange membrane used in a fuel cell. PS microspheres were synthesized by emulsion polymerization. PSSA microspheres with 5.3 mmol/g ion‐exchange capacity (IEC) were prepared by sulfonation of PS microspheres. The composite membranes were prepared by solution casting. SPAES/PSSA composite membranes showed higher proton conductivity than a SPAES membrane because of the IEC improved by adding PSSA. Although the addition of PSSA also brought about the increase of a methanol permeability, the proton/methanol selectivity defined as the ratio of the proton conductivity to the methanol permeability was improved at low humidity by adding 5 wt % of PSSA microspheres. Differential scanning calorimetry results indicated that the amount of free water varied in the cases of the addition of the two kinds of organic microspheres. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008