The invention provides a crosslinkable aromatic resin having a protonic acid group and a crosslinkable group, suitable for electrolytic membranes and binders used in fuel cells, etc., and electrolytic polymer membranes, binders and fuel cells using the resin. The crosslinkable aromatic resin has a crosslinkable group, which is not derived from the protonic acid group and can form a polymer network without any elimination component. This resin exhibits excellent ion conductivity, heat resistance, water resistance, adhesion property and low methanol permeability. Preferably, the crosslinkable group is composed of a C
1
to C
10
alkyl group directly bonded to the aromatic ring and/or an alkylene group having 1 to 3 carbon atoms in the main chain in which at least one carbon atom directly bonded to the aromatic ring bonds to hydrogen, and a carbonyl group, or a carbon-carbon double bond or triple bond. The aromatic resins such as aromatic polyethers, aromatic polyamides, aromatic polyimides, aromatic polyamideimides, aromatic polyazoles, etc., which contain such a crosslinkable group, are preferred as the crosslinkable aromatic resins having a protonic acid group and a crosslinkable group.
本发明提供了一种具有质子酸基团和可交联基团的可交联芳香族
树脂,适用于燃料电池等中使用的电解膜和粘结剂,以及使用该
树脂的电解聚合物膜、粘结剂和燃料电池。可交联芳香族
树脂具有可交联基团,该基团并非来自质子酸基团,可形成聚合物网络,且不含任何消除成分。这种
树脂具有优异的离子传导性、耐热性、耐
水性、粘附性和低
甲醇渗透性。可交联基团最好由 C
1
至 C
10
烷基和/或主链上有 1 至 3 个碳原子的亚烷基,其中至少有一个直接与芳香环键合的碳原子与氢、羰基或碳碳双键或三键键合。芳香族
树脂,如芳香族聚醚、芳香族聚酰胺、芳香族聚
酰亚胺、芳香族聚酰胺
酰亚胺、芳香族聚唑等,含有这样的可交联基团,作为具有质子酸基团和可交联基团的可交联芳香族
树脂是首选。