Polymer, electrolyte material, electrolyte membrane, electrolyte membrane with catalyst layer, membrane electrode assembly, solid polymer fuel cell, and solid polymer water electrolysis device

A polymer having a structure represented by the following formula (1).

• [In the formula (1),
• A1 denotes a constitutional unit represented by the following formula (a1),
• A2 denotes a constitutional unit represented by the following formula (a2),
• L1 and L2 each independently denote a single bond, —O—, —S—, or —SO2—,
• n denotes an integer in a range of 10 to 100,
• * represents a bonding site,
• a plurality of A1 are identical to one another,
• a plurality of A2 are identical to one another,
• a plurality of L1 may be identical to or different from one another, and
• a plurality of L2 may be identical to or different from one another.]
• [In the formula (a1),
• IExG denotes an ion-exchange group,
• L3 denotes a single bond, —O—, —S—, —SO2—, or —CO—,
• x denotes an integer in a range of 2 to 10,
• * represents a bonding site,
• a plurality of IExG may be identical to or different from one another, and
• a plurality of L3 may be identical to or different from one another.]
• [In the formula (a2),
• Ar denotes an arylene group having no ion-exchange group,
• L4 denotes a single bond, —O—, —S—, —SO2—, or —CO—,
• y denotes an integer in a range of 3 to 20,
• * represents a bonding site,
• a plurality of Ar may be identical to or different from one another, and
• a plurality of L4 may be identical to or different from one another.]