Abstract
Proton exchange membranes were prepared by simultaneous radiation grafting of styrene onto Teflon-FEP films and subsequent sulfonation. Degrees of grafting from 13 to 52% were obtained. FTIR-ATR in combination with FTIR measurements show a homogeneous distribution of polystyrene across the grafted film. Water uptake after swelling in boiling water and specific conductivity of the sulfonated membranes were determined. The strong decrease in specific resistivity with increasing degree of grafting is due to an increasing proton mobility, reflected by an increasing hydration of the sulfonic acid groups. For degrees of grafting higher than 30% specific resistivity values at low as 2 Ω-cm (20°C) are measured, compared with a value of 12 Ω-cm for Nafion 117 membranes.
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