Preparation and characterization of crosslinked cellulose/sulfosuccinic acid membranes as proton conducting electrolytes

Jin Ah Seo, Jung Chul Kim, Jong Kwan Koh, Sung Hoon Ahn, Jong Hak Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A series of crosslinked polymer electrolyte membranes were prepared by blending cellulose and sulfosuccinic acid (SA) for fuel cell applications. The crosslinking reaction of membranes occurred via the esterification between -OH of cellulose and -COOH of SA, as confirmed by FT-IR spectroscopy. Both the ion exchange capacity and the proton conductivity increased in proportion to the increase of SA concentrations due to the increasing portion of charged groups in the membrane. In contrast, the water uptake linearly increased up to 25 wt.% of SA concentration, above which it decreased abruptly. The maximum behavior of water uptake may be a result of competitive effect between the increasing number of ionic sites and the increasing degree of crosslinking with the SA concentrations. Wide angle X-ray scattering also showed that the crystalline structures of cellulose disappeared upon the introduction of SA. The mechanical properties of cellulose/SA membranes, i.e., tensile strength at break and Young's modulus, showed a maximum at 15 wt.% of SA, as revealed by universal testing machine. These membranes exhibited good thermal stability up to 250 °C, as revealed by thermal gravimetric analysis.

Original languageEnglish
Pages (from-to)555-560
Number of pages6
JournalIonics
Volume15
Issue number5
DOIs
Publication statusPublished - 2009 Sep

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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