COMPOSITION, COMPOSITE PREPARED FROM THE COMPOSITION, ELECTRODE USING THE COMPOSITION OR THE COMPOSITE, COMPOSITE MEMBRANE INCLUDING THE COMPOSITE, AND FUEL CELL INCLUDING THE COMPOSITE MEMBRANE

A composition including a cross-linkable compound and at least one compound represented by Formula 1 below, a composite obtained from the composition, an electrode including the composition or the composite, a composite membrane including the composite, and a fuel cell including the composite membrane. wherein, in Formula 1 above, a, b and R are defined as in the specification.