Abstract
The effect of a microwave irradiation at 2450 MHz on the swelling and permeation properties of a Nafion membrane in water and methanol media has been studied. The influence of the irradiation power and the exposure time has been analyzed. The results found show that the irradiation hardly affects the membrane liquid uptake, but it affects the expansion properties of the membrane. The hydraulic permeability coefficient of the unmodified and the irradiated membranes has been experimentally determined. Higher hydraulic permeability has been obtained for the irradiated membranes in both water and methanol, but the degree of increment in permeability coefficient with microwave depends on kinds of permeation liquid. The results have been discussed considering the degradation effect occurring on the membrane hydrophobic matrix, which affects to the membrane elastic properties.
Highlights
Perfluorinate ionomer membranes are very interesting materials used in many applications as solid polymer electrolyte in fuel cells and other applications in electrochemistry and separation technologies
It is found that the water hydrodynamic permeability coefficient is lower than those of methanol in all membranes, in agreement with the results shown in the previous section
The effect of a microwave irradiation on the swelling and hydraulic permeation properties of a Nafion membrane has been studied in water and methanol media
Summary
Perfluorinate ionomer membranes are very interesting materials used in many applications as solid polymer electrolyte in fuel cells and other applications in electrochemistry and separation technologies. In all these applications, the behavior of the membrane is of the greatest importance to the viability and performance of the involved processes. The high methanol permeability and the hydration dependence of Nafion [7] make necessary to look for alternative polymer electrolytes In this search, Nafion uses to be the reference membrane to compare the properties of the alternative membranes
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