Control of water-channel structure and state of water in sulfonated poly(arylene ether sulfone)/diethoxydimethylsilane in situ hybridized proton conductors and its influence on transport properties for DMFC membranes

Soon Yong So, Young Taik Hong, Sung Chul Kim, Sang Young Lee

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

A new approach for noticeably improving the DMFC membrane transport properties of sulfonated poly(arylene ether sulfone) copolymers (SPAES) has been demonstrated, which is based on controlling the water-channel structure and the state of water by in situ hybridization of ORMOSIL (Organically Modified SILicates). Diethoxydimethylsilane (DEDMS) was employed as a functional ORMOSIL precursor. Its hydrophobic nature made it possible to adjust the hydrophilicity of the resulting hybrid membranes. An increase of DEDMS uptake into SPAES membranes allowed the water uptake to decrease and the water channels to become narrow and tortuous. The influence of DEDMS uptake on the state of water was investigated by measuring the characteristic melting peak of water at 0 °C. Based on this investigation, the dependence of water uptake on the state of water was quantitatively identified. A noteworthy observation is that the incorporation of DEDMS into SPAES was effective in suppressing the methanol crossover with slightly sacrificing the proton conductivity, resulting in the higher selectivity. This improvement in DFMC membrane transport properties was discussed in terms of the water-channel structure and the state of water.

Original languageEnglish
Pages (from-to)131-135
Number of pages5
JournalJournal of Membrane Science
Volume346
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

Bibliographical note

Funding Information:
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy and National Research Foundation of Korea Grant funded by the Korean Government (2009-0066986).

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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