Composition, polymer thereof, electrode and electrolyte membrane for fuel cell, and fuel cell including the same

An electrolyte membrane for a fuel cell, the electrolyte membrane comprising a composition comprising at least one of a compound represented by Formula 1 below and a compound represented by Formula 2 below:

• wherein, in Formulae 1 and 2, R1 through R4 are each independently a hydrogen atom, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C1-C20 alkoxy group, a substituted or unsubstituted C2-C20 alkenyl group, a substituted or unsubstituted C2-C20 alkynyl group, a substituted or unsubstituted C6-C20 aryl group, a substituted or unsubstituted C6-C20 aryloxy group, a substituted or unsubstituted C2-C20 heteroaryl group, a substituted or unsubstituted C2-C20 heteroaryloxy group, a substituted or unsubstituted C4-C20 carbocyclic group, a substituted or unsubstituted C4-C20 carbocyclic oxy group, a substituted or unsubstituted C2-C20 heterocyclic group, a substituted or unsubstituted C2-C20 heterocyclicoxy group, a halogen atom, a hydroxyl group, or a cyano group,
• R6 is selected from the group consisting of a substituted or unsubstituted C1-C20 alkylene group, a substituted or unsubstituted C2-C20 alkenylene group, a substituted or unsubstituted C2-C20 alkynylene group, a substituted or unsubstituted C6-C20 arylene group, a substituted or unsubstituted C2-C20 heteroarylene group, —C(═O)—, and —SO2—, and
• R5 and R′5 are each independently —(CF2)n—CF3 wherein n is an integer from 1 to 20, or the group represented by Formula 3 below wherein n is an integer from 1 to 20, and
• wherein, in Formula 3, n is an integer from 1 to 20, and b is an integer from 1 to 5, and
• R7 is identical or different from each other and is selected from among a hydrogen atom, fluorine, a C1-C20 alkyl group, a fluorinated C1-C20 alkyl group, a C6-C20 aryl group, and a fluorinated C6-C20 aryl group.