Patent ID: 8426081

Claim:
A method of preparing an electrolyte membrane comprising a crosslinked object of a polybenzoxazine-based compound formed of a polymerized resultant product of a first benzoxazine-based monomer represented by Formula 1 below or a second benzoxazine-based monomer represented by Formula 2 below with a crosslinkable compound, the method comprising: mixing the first benzoxazine-based monomer of Formula 1 or the second benzoxazine-based monomer of Formula 2 with the crosslinkable compound to form a resultant mixture, the crosslinkable compound including at least one of a polybenzimidazole, a polybenzthiazole, a polybenzoxazole, and a polyimide; and curing the resultant mixture to form a resultant, and then impregnating the resultant with a proton conductor: wherein, R 1 in Formula 1 is hydrogen, a substituted or nonsubstituted C1-C20 alkyl group, a substituted or nonsubstituted C1-C20 alkenyl group, a substituted or nonsubstituted C1-C20 alkynyl group, a substituted or nonsubstituted C6-C20 aryl group, a substituted or nonsubstituted C2-C20 heteroaryl group, a substituted or nonsubstituted C4-C20 cycloalkyl group, a substituted or nonsubstituted C2-C20 heterocyclic group, a halogen atom, a hydroxyl group, or a cyano group; and R 2 in Formula 1 is a substituted or nonsubstituted C1-C20 alkyl group, a substituted or nonsubstituted C1-C20 alkenyl group, a substituted or nonsubstituted C1-C20 alkynyl group, a substituted or nonsubstituted C6-C20 aryl group, a substituted or nonsubstituted C7-C20 arylalkyl group, a substituted or nonsubstituted C2-C20 heteroaryl group, a substituted or nonsubstituted C2-C20 heteroarylalkyl group, a substituted or nonsubstituted C4-C20 carbocyclic group, a substituted or nonsubstituted C4-C20 carbocyclic alkyl group, a substituted or nonsubstituted C2-C20 heterocyclic group, or a substituted or nonsubstituted C2-C20 heterocyclic alkyl group; wherein, R 2 in Formula 2 is a substituted or nonsubstituted C1-C20 alkyl group, a substituted or nonsubstituted C1-C20 alkenyl group, a substituted or nonsubstituted C1-C20 alkynyl group, a substituted or nonsubstituted C6-C20 aryl group, a substituted or nonsubstituted C7-C20 arylalkyl group, a substituted or nonsubstituted C2-C20 heteroaryl group, a substituted or nonsubstituted C2-C20 heteroarylalkyl group, a substituted or nonsubstituted C4-C20 carbocyclic group, a substituted or nonsubstituted C4-C20 carbocyclic alkyl group, a substituted or nonsubstituted C2-C20 heterocyclic group, or a substituted or nonsubstituted C2-C20 heterocyclic alkyl group; and R 3 in Formula 2 is a substituted or nonsubstituted C1-C20 alkylene group, a substituted or nonsubstituted C1-C20 alkenylene group, a substituted or nonsubstituted C1-C20 alkynylene group, a substituted or nonsubstituted C6-C20 arylene group, a substituted or nonsubstituted C2-C20 heteroarylene group, —C(═O)—, or —SO 2 —.