Multi-acid polymers for use as a fuel cell membrane, for example, have multi-acid monomers that have an imide base and more than two proton conducting groups. The multi-acid polymers are made by reacting a polymer precursor in sulfonyl fluoride or sulfonyl chloride form with a compound with an acid giving group. One example of a multi-acid polymer is:
wherein R is one or more units of a non-SO2F or non-SO2Cl portion of a polymer precursor in sulfonyl fluoride or sulfonyl chloride form.
例如,用作燃料电池膜的多酸聚合物具有多酸单体,这些单体具有一个
酰亚胺基和两个以上的质子传导基团。多酸聚合物是由磺酰
氟或
磺酰氯形式的聚合物前体与带有酸性基团的化合物反应制成的。多酸聚合物的一个例子是
其中 R 是磺酰
氟或
磺酰氯形式的聚合物前体的非SO2F 或非SO2Cl 部分的一个或多个单元。