Proton exchange membranes were prepared by natural latex and vinyl acetate-ester acrylic for determining its use in a fuel cell. The time of sulfonation reaction of two and three hours were used, and the vanadium pentoxide was also used as load. Sulfonated and loaded membranes have highest values of water uptake and ionic exchange capacity, while membranes without load are more stables than loaded membranes. FTIR spectra analysis was carried out for determining the characteristic functional groups of the each membrane. Sulfonated membranes during three hours have the highest mechanical properties such as tensile stretch, and elongation.
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