Provided is a solid polymer electrolyte having increased heat resistance and high proton conductivity and a proton conductive membrane composed of the electrolyte. Also provided is a copolymer having a sulfonic acid group. The copolymer includes a repeating unit represented by Formula (1):
(in the formula, Y denotes at least one kind of structure selected from the group consisting of —CO—, —SO
2
—, —SO—, —CONH—, —COO—, —(CF
2
)
l
— (l is an integer of 1 to 10), and —C(CF
3
)
2
—; W denotes at least one kind of structure selected from the group consisting of a direct bond, —CO—, —SO
2
—, —SO—, —CONH—, —COO—, —(CF
2
)
l
— (l is an integer of 1 to 10), —C(CF
3
)
2
—, —O—, and —S—; Z denotes a direct bond or at least one kind of structure selected from the group consisting of —(CH
2
)
l
—(l is an integer of 1 to 10), —C(CH
3
)
2
—, —O—, —S—, —CO—, and —SO
2
—; R
30
denotes a nitrogen-containing aromatic ring having a substituent represented by —SO
3
H, —O(CH
2
)
h
SO
3
H, or —O(CF
2
)
h
SO
3
H (h is an integer of 1 to 12); p is an integer of 0 to 10; q is an integer of 0 to 10; r is an integer of 1 to 5; and k is an integer of 0 to 4).
提供了一种具有增强耐热性和高质子导电性的固体聚合物电解质,以及由该电解质组成的质子导电膜。还提供了一种具有
磺酸基团的共聚物。该共聚物包括由式(1)表示的重复单元:(在公式中,Y表示来自由- CO-、- SO2-、- SO-、- CONH-、- COO-、-(
CF2)l-(l为1至10的整数)、和- C(
CF3)2-等结构中至少一种的结构;W表示来自由直接键、- CO-、- SO2-、- SO-、- CONH-、- COO-、-(
CF2)l-(l为1至10的整数)、- C( )2-、- O-、和- S-等结构中至少一种的结构;Z表示直接键或来自由-(
CH2)l-(l为1至10的整数)、- C(
CH3)2-、- O-、- S-、- CO-、和- SO2-等结构中至少一种的结构;R30表示含有一个取代基为- SO3H、- O( )hSO3H、或- O(
CF2)hSO3H(h为1至12的整数)的氮含有芳香环;p为0至10的整数;q为0至10的整数;r为1至5的整数;k为0至4的整数)。