Abstract
A novel composite membrane based on poly(vinyl alcohol) (PVA) with embedded phosphotungstic acid (PWA) were prepared and their proton conductivity and methanol permeability were studied. Infrared (IR) and UV spectrographic measurement indicates that the Keggin structure characteristic of the PW 12O 40 3− anion presents in the PVA membranes. Highest proton conductivity of 6.27×10 −3 S/cm was measured at room temperature. The methanol permeability of these composite membranes ranges from 1.28×10 −7 to 4.54×10 −7 cm 2/s.
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