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Methods of treating Nafion (TM) proton exchange membrane (PEM) to improve resistance to permeability of methanol in DMFC (Direct Methanol Fuel Cell) operation. The PEM includes a semi-permeable polyelectrolyte film made of a recast polyelectrolyte acid polymer. The polyelectrolyte film extends along an axis and is uniaxially stretched along the axis. The polyelectrolyte film remains stretched when immersed in a methanol or methanol and water solution. Applications: PEM Fuel cells
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