Proton-conductive membrane and fuel cell

A method for the production of a proton-conductive membrane comprising a crosslinked polymer and a plasticizer,

• wherein the crosslinked polymer includes a proton acceptor group in an amount equal to 10 mol % or more of repeating units constituting the crosslinked polymer,
• wherein the plasticizer includes a proton donor compound having a pKa value of 2.5 or less,
• wherein the proton-conductive membrane is a viscoelastic solid in a temperature range of 50° C. to 120° C., and
• wherein the method comprises:
• polymerizing a first monomer, which is a vinyl monomer including a proton acceptor group, to obtain a precursor polymer, then adding a crosslinking agent to the precursor polymer, and then crosslinking the precursor polymer to obtain the crosslinked polymer.

A method for the production of a proton-conductive membrane comprising a crosslinked polymer and a plasticizer,

• wherein the crosslinked polymer includes a proton acceptor group in an amount equal to 10 mol % or more of repeating units constituting the crosslinked polymer,
• wherein the plasticizer includes a proton donor compound having a pKa value of 2.5 or less,
• wherein the proton-conductive membrane is a viscoelastic solid in a temperature range of 50° C. to 120° C., and
• wherein the method comprises:
• polymerizing and crosslinking a first monomer, which is a vinyl-based monomer including a proton acceptor group, and a second monomer, which is a crosslinkable vinyl monomer, to obtain the crosslinked polymer.