Abstract
Measurements of the electro-osmotic drag coefficient for Nafion® and both random and multi-block co-polymer sulfonated poly(arylene ether sulfone) (BPSH) chemistries are reported for vapor equilibrated samples below 0 {degree sign}C. No significant change in the drag coefficient behavior for Nafion from that reported above 0 {degree sign}C is found. However BPSH is found to have a drag coefficient of 0.4. The implication of a drag coefficient less than unity in the interpretation of conduction mechanisms is discussed. Measurements of water sorption isotherms below 0 {degree sign}C are also presented. A significant reduction in the capacity of polymer electrolytes to store water below 0 {degree sign}C is found. This reduced water content is a result of the lower vapor pressure of ice compared to supercooled liquid.
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