Ionomer for fuel cell capable of self-assembly and method of preparing the same

A fuel cell comprising:

• an electrolyte membrane;
• a cathode disposed on a first surface of the electrolyte membrane;
• and
• an anode disposed on a second surface of the electrolyte membrane;
• and
• wherein the electrolyte membrane, the cathode, or the anode comprises an ionomer comprising a copolymer having no carbon-oxygen bond, wherein the copolymer comprises:
• first blocks disposed at both ends, wherein each first block comprises a first styrene unit and a side chain grafted to the first styrene unit, wherein the side chain comprises a repeating unit comprising a second styrene unit and a proton conductive functional group grafted to the second styrene unit;
• and
• a second block interposed between the first blocks, wherein the second block comprises an ethylene-based unit, a butylene-based unit, an isoprene-based unit, or any combination thereof.

An ionomer for a fuel cell, the ionomer comprising:

• a copolymer having no carbon-oxygen bond, wherein the copolymer comprises:
• first blocks disposed at both ends, wherein each first block comprises a first styrene unit and a proton conductive functional group;
• and
• a second block interposed between the first blocks, wherein the second block comprises an ethylene-based unit, a butylene-based unit, an isoprene-based unit, or any combination thereof;
• wherein the copolymer comprises a compound represented by
• wherein x1=x×a, x2=x×(1−a), a is a number from 0.1 to 0.9, and x is a number from 10 to 1,000;
• wherein x1′=x′×(1−a′), x2′=x′×a′, a′ is a number from 0.1 to 0.9, and x′ is a number from 10 to 1,000;
• wherein y is a number from 10 to 1,000;
• wherein z is a number from 10 to 1,000;
• and
• wherein n is a number from 2 to 12.