期刊
MACROMOLECULAR RESEARCH
卷 16, 期 6, 页码 549-554出版社
POLYMER SOC KOREA
DOI: 10.1007/BF03218558
关键词
polymer electrolyte membrane fuel cell (PEMFC); crosslinked; triblock copolymer; proton conductivity; polymer blend
资金
- Ministry of Commerce, Industry and Energy (MOCIE)
- Korea Science and Engineering Foundation (KOSEF)
- Korea government (MOST) [R11-2007-05004003-0]
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 degrees 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 SO3H 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 degrees 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.
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