Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Proton Conducting Crosslinked Membranes by Polymer Blending of Triblock Copolymer and Poly(vinyl alcohol)

  • Lee, Do-Kyoung (Department of Chemical Engineering, Yonsei University) ;
  • Park, Jung-Tae (Department of Chemical Engineering, Yonsei University) ;
  • Choi, Jin-Kyu (Department of Chemical Engineering, Yonsei University) ;
  • Roh, Dong-Kyu (Department of Chemical Engineering, Yonsei University) ;
  • Lee, Jung-Hyun (Department of Chemical Engineering, Yonsei University) ;
  • Shul, Yong-Gun (Department of Chemical Engineering, Yonsei University) ;
  • Kim, Jong-Hak (Department of Chemical Engineering, Yonsei University)
  • Published : 2008.08.31
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Abstract

Proton conducting crosslinked membranes were prepared using polymer blends of polystyrene-b-poly(hydroxyethyl acrylate)-b-poly(styrene sulfonic acid) (PS-b-PHEA-b-PSSA) and poly(vinyl alcohol) (PVA). PS-b-PHEA-b-PSSA triblock copolymer at 28:21:51 wt% was synthesized sequentially using atom transfer radical polymerization (ATRP). FT-IR spectroscopy showed that after thermal ($120^{\circ}C$, 2 h) and chemical (sulfosuccinic acid, SA) treatments of the membranes, the middle PHEA block of the triblock copolymer was crosslinked with PVA through an esterification reaction between the -OH group of the membrane and the -COOH group of SA. The ion exchange capacity (IEC) decreased from 1.56 to 0.61 meq/g with increasing amount of PVA. Therefore, the proton conductivity at room temperature decreased from 0.044 to 0.018 S/cm. However, the introduction of PVA resulted in a decrease in water uptake from 87.0 to 44.3%, providing good mechanical properties applicable to the membrane electrode assembly (MEA) of fuel cells. Transmission electron microscopy (TEM) showed that the membrane was microphase-separated with a nanometer range with good connectivity of the $SO_3H$ ionic aggregates. The power density of a single $H_2/O_2$ fuel cell system using the membrane with 50 wt% PVA was $230\;mW/cm^2$ at $70^{\circ}C$ with a relative humidity of 100%. Thermogravimetric analysis (TGA) also showed a decrease in the thermal stability of the membranes with increasing PVA concentration.

Keywords

References

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