Provided are an aromatic sulfonic acid derivative and a sulfonic acid group-containing polymer, each of which has excellent proton conductivity even under low humidification conditions, while having excellent mechanical strength and chemical stability, and enables a solid polymer fuel cell to achieve high output and excellent physical durability when used therein. This aromatic sulfonic acid derivative has a specific structure and is characterized in that a sulfonic acid group is introduced into more than 50% of all the phenyl groups. This sulfonic acid group-containing polymer is characterized by being obtained by polymerization using the aromatic sulfonic acid derivative, and is also characterized by having a specific structure.
本发明提供了一种芳香族
磺酸衍
生物和一种含
磺酸基团的聚合物,它们即使在低湿度条件下也具有出色的质子传导性,同时还具有出色的机械强度和
化学稳定性,可使固体聚合物燃料电池在使用时实现高输出和出色的物理耐久性。这种芳香族
磺酸衍
生物具有特定的结构,其特点是在所有苯基的 50%以上引入了
磺酸基团。这种含
磺酸基团的聚合物的特点是通过使用芳香族
磺酸衍
生物进行聚合而获得,其特征还在于具有特定的结构。