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The durability and degradation behavior of the Nafion NR111 proton exchange membranes (PEMs) is investigated in detail under various mechanical, chemical and polarization conditions. It was found that the fatigue strength or the safety limit of the cyclic stress for Nafion NR111 membrane is ∼1.5MPa that is 1/10 of the tensile strength of the membrane. The cyclic stress and dimensional change (or strain)...
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