%0 Journal Article %K PEM fuel cells %K PFSA membranes %K Nafion xl %K Composite membranes %K Structure/property %K Saxs/waxs %K Polymer electrolyte membrane (pem) %K Proton-exchange membranes %K Fuel-cell membranes %K Sulfonic-acid membrane %K Chemical degradation %K Mechanical durability %K Relaxation phenomena %K Humidity cycles %K Through-plane %A Shouwen Shi %A Adam Z Weber %A Ahmet Kusoglu %B Journal of Membrane Science %D 2016 %P 123 - 134 %R 10.1016/j.memsci.2016.06.004 %T Structure/property relationship of Nafion XL composite membranes %V 516 %8 10/2016 %! Journal of Membrane Science