화학공학소재연구정보센터
Macromolecular Research, Vol.15, No.5, 412-417, August, 2007
Influence of Silica Content in Crosslinked PVA/PSSA_MA/Silica Hybrid Membrane for Direct Methanol Fuel Cell (DMFC)
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In the present study, crosslinked poly(vinyl alcohol) (PVA) membranes were prepared at different temperatures using poly(styrene sulfonic acid-co-maleic acid) (PSSA_MA) (PVA:PSSA_MA = 1:9). The hybrid membranes were prepared by varying the TEOS content between 5 and 30 wt%. The PSSA_MA was used both as a crosslinking agent and the hydrophilic group donor (-SO3H and/or -COOH). The proton conductivity increased with up to 20 wt% TEOS, but decreased above this level, although the water content decreased with increasing TEOS content. This result suggests that the silica doped into the membrane improved the formation of proton-conduction pathways due to the absorption of molecular water. The PVA/PSSA_MA/Silica containing TEOS 20% showed both high proton conductivity (0.026 S/cm at 90 ℃) and low methanol permeability (5.55×10-7 cm2/s).
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