Grafted polymer electrolyte membrane, method of producing a grafted polymer electrolyte membrane, and fuel cell comprising the same

A method of producing an electrolyte membrane comprising:

• preparing a precursor membrane comprising a polymer which is capable of being graft polymerized;
• exposing the surface of the precursor membrane to a plasma in an oxidative atmosphere;
• graft-polymerizing a side chain polymer to the plasma treated precursor membrane;
• and
• introducing a proton conductive functional group to the side chain.

A membrane made by a process comprising:

• preparing a precursor membrane comprising a polymer which is capable of being graft polymerized;
• exposing the surface of the precursor membrane to a plasma in an oxidative atmosphere;
• graft-polymerizing a side chain polymer to the plasma treated precursor membrane;
• and introducing a proton conductive functional group to the side chain.