Ionomer resin, and ionomer solution, multilayer body, member, electrochemical element, and electrochemical device that include the same

A multilayer body comprising two or more layers, wherein

• the layers include
• a first layer containing an ionomer resin, and
• a second layer that has an anion-exchange polymer electrolyte membrane,
• the first layer is stacked on the second layer, and
• the ionomer resin comprises a copolymer containing a first structural unit represented by the following formula (1):
• wherein
• in the formula (1),
• L1 to L5 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkanol group having 1 to 4 carbon atoms, or a structure represented by the following formula (2-1) or (2-2):
• at least one of L1 to L5 is a structure represented by the formula (2-1) or (2-2), and
• L6 is a hydrogen atom, a methyl group, or an ethyl group, and
• in the formulae (2-1) and (2-2),
• R1 to R3, R11 to R13, and R21 to R23 are each independently an alkyl group having 1 to 8 carbon atoms or an alkanol group having 1 to 8 carbon atoms,
• M1, M11, and M21 are each independently a linear hydrocarbon chain having 3 to 8 carbon atoms,
• the hydrocarbon chain optionally has a substituent replacing a hydrogen atom bonded to a carbon atom of the hydrocarbon chain,
• the substituent is at least one selected from the group consisting of a halogen atom and an alkyl group having 1 to 5 carbon atoms,
• Z1, Z11, and Z21 are each independently a nitrogen atom or a phosphorus atom,
• Z2 is a nitrogen atom bonded to one hydrogen atom, an oxygen atom, or a sulfur atom, and
• Z12 is a nitrogen atom.

A multilayer body comprising two or more layers, wherein

• the layers include
• a first layer containing an ionomer resin, and
• a catalyst layer,
• the first layer is stacked on the catalyst layer, and
• the ionomer resin comprises a copolymer containing a first structural unit represented by the following formula (1):
• wherein
• in the formula (1),
• L1 to L5 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkanol group having 1 to 4 carbon atoms, or a structure represented by the following formula (2-1) or (2-2):
• at least one of L1 to L5 is a structure represented by the formula (2-1) or (2-2), and
• L6 is a hydrogen atom, a methyl group, or an ethyl group, and
• in the formulae (2-1) and (2-2),
• R1 to R3, R11 to R13, and R21 to R23 are each independently an alkyl group having 1 to 8 carbon atoms or an alkanol group having 1 to 8 carbon atoms,
• M1, M11, and M21 are each independently a linear hydrocarbon chain having 3 to 8 carbon atoms,
• the hydrocarbon chain optionally has a substituent replacing a hydrogen atom bonded to a carbon atom of the hydrocarbon chain,
• the substituent is at least one selected from the group consisting of a halogen atom and an alkyl group having 1 to 5 carbon atoms,
• Z1, Z11, and Z21 are each independently a nitrogen atom or a phosphorus atom,
• Z2 is a nitrogen atom bonded to one hydrogen atom, an oxygen atom, or a sulfur atom, and
• Z12 is a nitrogen atom.

An electrochemical element comprising an anion-exchange polymer electrolyte membrane and an electrode, wherein

• a principal surface of the anion-exchange polymer electrolyte membrane is in contact with a principal surface of the electrode, and
• the electrode contains an ionomer resin comprising a copolymer containing a first structural unit represented by the following formula (1):
• wherein
• in the formula (1),
• L1 to L5 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkanol group having 1 to 4 carbon atoms, or a structure represented by the following formula (2-1) or (2-2):
• at least one of L1 to L5 is a structure represented by the formula (2-1) or (2-2), and
• L6 is a hydrogen atom, a methyl group, or an ethyl group, and
• in the formulae (2-1) and (2-2),
• R1 to R3, R11 to R13, and R21 to R23 are each independently an alkyl group having 1 to 8 carbon atoms or an alkanol group having 1 to 8 carbon atoms,
• M1, M11, and M21 are each independently a linear hydrocarbon chain having 3 to 8 carbon atoms,
• the hydrocarbon chain optionally has a substituent replacing a hydrogen atom bonded to a carbon atom of the hydrocarbon chain,
• the substituent is at least one selected from the group consisting of a halogen atom and an alkyl group having 1 to 5 carbon atoms,
• Z1, Z11, and Z21 are each independently a nitrogen atom or a phosphorus atom,
• Z2 is a nitrogen atom bonded to one hydrogen atom, an oxygen atom, or a sulfur atom, and
• Z12 is a nitrogen atom.