Preparation and characterization of anhydrous polymer electrolyte membranes based on poly(vinyl alcohol-co-ethylene) copolymer

Abstract

Anhydrous polymer electrolyte membranes with cross-linked structure have been prepared based on poly(vinyl alcohol-co-ethylene) (PVA-co-PE) copolymer. The PVA units of copolymer served to induce thermal cross-linking with 4,5-imidazole dicarboxylic acid (IDA) via esterification while PE units controlled the membrane swelling and the mechanical properties of films. Upon doping with phosphoric acid (PA, H3PO4) to form imidazole-PA complexes, the proton conductivity of membranes continuously increased with increasing PA content. As a result, proton conductivity reached 0.01 S/cm at 100 °C under anhydrous conditions. X-ray diffraction analysis revealed that both the d-spacing and crystalline peak of membranes were reduced upon introduction of IDA/PA due to the cross-linking effect. The PVA-co-PE/IDA/PA membranes exhibited good mechanical properties, e.g., 150 MPa of Young’s modulus, as determined by a universal testing machine. Thermal gravimetric analysis also represented that the thermal stability of membranes was increased up to 200 °C upon introduction of IDA/PA.

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Acknowledgment

This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MEST) (R01-2008-000-10112-0) and (MOEHRD, Basic Research Promotion Fund) (KRF-2008-331-D00152).

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Correspondence to Jong Hak Kim or Ki Bong Lee.

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Ahn, S.H., Lee, D.K., Seo, J.A. et al. Preparation and characterization of anhydrous polymer electrolyte membranes based on poly(vinyl alcohol-co-ethylene) copolymer. Ionics 16, 475–480 (2010). https://doi.org/10.1007/s11581-009-0412-7

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Keywords

  • Polymer electrolyte membrane
  • Anhydrous
  • Cross-linking
  • Proton conductivity
  • Fuel cells