Polymer electrolyte material, production method thereof and membrane electrode assembly for polymer electrolyte fuel cell

A polymer electrolyte material comprising a polymer having a repeating unit based on an alicyclic fluoromonomer having a carbon-carbon double bond with radical polymerization reactivity, either of carbon atoms at both ends of the double bond constituting a ring structure, wherein the fluoromonomer has an ionic group represented by —(SO2X(SO2Rf)a)−M+ where M+ is H+, a monovalent metal cation or an ammonium ion at least one hydrogen atom of which may be substituted by a hydrocarbon group, Rf is a linear or branched perfluoroalkyl group which may contain an oxygen atom of an ether bond type, X is a nitrogen atom, and a=1.

A polymer electrolyte material comprising a polymer having a repeating unit based on an alicyclic fluoromonomer having a carbon-carbon double bond with radical polymerization reactivity, either of carbon atoms at both ends of the double bond constituting a ring structure, wherein the fluoromonomer has an ionic group represented by —(SO2X(SO2Rf)a)−M+ where M+ is H+, a monovalent metal cation or an ammonium ion at least one hydrogen atom of which may be substituted by a hydrocarbon group, Rf is a linear or branched perfluoroalkyl group which may contain an oxygen atom of an ether bond type, X is a carbon atom, and a=2.

A polymer electrolyte membrane comprising a polymer having a repeating unit based on an alicyclic fluoromonomer having a carbon-carbon double bond with radical polymerization reactivity, either of carbon atoms at both ends of the double bond constituting a ring structure, wherein the fluoromonomer has an ionic group represented by —(SO2X(SO2Rf)a)−M+ where M+ is H+, a monovalent metal cation or an ammonium ion at least one hydrogen atom of which may be substituted by a hydrocarbon group, Rf is a linear or branched perfluoroalkyl group which may contain an oxygen atom of an ether bond type, X is an oxygen atom, a nitrogen atom or a carbon atom, a=0 in the case of X being an oxygen atom, a=1 in the case of X being a nitrogen atom, and a=2 in the case of X being a carbon atom.

A liquid composition having a polymer electrolyte material dissolved or dispersed in at least one solvent selected from the group consisting of a solvent having a hydroxyl group, and water, wherein the polymer electrolyte material comprises a polymer having a repeating unit based on an alicyclic fluoromonomer having a carbon-carbon double bond with radical polymerization reactivity, either of carbon atoms at both ends of the double bond constituting a ring structure, wherein the fluoromonomer has an ionic group represented by —(SO2X(SO2Rf)a)−M+ where M+ is H+, a monovalent metal cation or an ammonium ion at least one hydrogen atom of which may be substituted by a hydrocarbon group, Rf is a linear or branched perfluoroalkyl group which may contain an oxygen atom of an ether bond type, X is an oxygen atom, a nitrogen atom or a carbon atom, a=0 in the case of X being an oxygen atom, a=1 in the case of X being a nitrogen atom, and a=2 in the case of X being a carbon atom.

A membrane electrode assembly for a polymer electrolyte fuel cell comprising a cathode and an anode each having a catalyst layer containing a catalyst and a polymer electrolyte, and a polymer electrolyte membrane disposed between the cathode and the anode, wherein the polymer electrolyte membrane is a polymer having a repeating unit based on an alicyclic fluoromonomer having a carbon-carbon double bond with radical polymerization reactivity, either of carbon atoms at both ends of the double bond constituting a ring structure, wherein the fluoromonomer has an ionic group represented by —(SO2X(SO2Rf)a)−M+ where M+ is H+, a monovalent metal cation or an ammonium ion at least one hydrogen atom of which may be substituted by a hydrocarbon group, Rf is a linear or branched perfluoroalkyl group which may contain an oxygen atom of an ether bond type, X is an oxygen atom, a nitrogen atom or a carbon atom, a=0 in the case of X being an oxygen atom, a=1 in the case of X being a nitrogen atom, and a=2 in the case of X being a carbon atom.

A membrane electrode assembly for a polymer electrolyte fuel cell comprising a cathode and an anode each having a catalyst layer containing a catalyst and a polymer electrolyte, and a polymer electrolyte membrane disposed between the cathode and the anode, wherein at least one of the catalyst layers of the cathode and the anode comprises a polymer having a repeating unit based on an alicyclic fluoromonomer having a carbon-carbon double bond with radical polymerization reactivity, either of carbon atoms at both ends of the double bond constituting a ring structure, wherein the fluoromonomer has an ionic group represented by —(SO2X(SO2Rf)a)−M+ where M+ is H+, a monovalent metal cation or an ammonium ion at least one hydrogen atom of which may be substituted by a hydrocarbon group, Rf is a linear or branched perfluoroalkyl group which may contain an oxygen atom of an ether bond type, X is an oxygen atom, a nitrogen atom or a carbon atom, a=0 in the case of X being an oxygen atom, a=1 in the case of X being a nitrogen atom, and a=2 in the case of X being a carbon atom.