Preparation and characterization of proton exchange membranes based on semi-interpenetrating sulfonated poly(imide-siloxane)/epoxy polymer networks

Chi-Hung Lee, Szu-Hsien Chen, Yen-Zen Wang, Chao-Chien Lin, Chih-Kai Huang, Ching-Nan Chuang, Chih-Kuang Wang and Kuo-Huang Hsieh

Energy, 2013, vol. 55, issue C, 905-915

Abstract: We prepared and characterized a series of semi-IPN (semi-interpenetrating polymer network) membranes based on SPISX–EP (sulfonated polyimide-siloxane and epoxy) polymers and compared their properties with those of a pure SPISX membrane and a commercially available proton exchange membrane. Overall, the SPISX5–EP (with 5 wt% PDMS (α,ω-diaminopropyl polydimethylsiloxane) in SPISX) membranes can be exhibited desirable mechanical properties and thermal stabilities, with proton conductivities superior to those of Nafion® 117 at 80 °C. The dimensional changes of the membranes and degrees of methanol transport decreased with increasing epoxy content; here, the effect of crosslinking had a greater effect than did the increased number of ionic exchange sites. The proton conductivities and methanol permeabilities of the membranes ranged from 10−3 to 10−2 S/cm and from 10−9 to 10−7 cm2/s, respectively, in the temperature range 25–90 °C. Transmission electron microscopy images indicated that the presence of large, well-connected hydrophilic domains was responsible for the large hydrolytic stability of the SPISX5–EP membranes; infrared spectroscopy confirmed these results. SPISX5–EP membranes featuring epoxy compositions of 30 and 40% exhibited greater hydrolytic stability relative to the corresponding SPISX membranes, suggesting their potential application as proton-conducting membranes in fuel cells.

Keywords: Epoxy; Semi-interpenetrating; Sulfonated polyimide; Durability; Proton exchange (search for similar items in EconPapers)
Date: 2013
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:55:y:2013:i:c:p:905-915

DOI: 10.1016/j.energy.2013.03.062

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