Hydrolytic and oxidative stabilities of sulfonated polyimide membranes are of significant concern when they are used as fuel cell polyelectrolyte membranes. To increase the hydrolytic and oxidative stabilities of sulfonated polyimide membranes, atriamine crosslinker, 4-(4-aminophenoxy)benzene-1,3-diamine, was synthesized, characterized, and successfully used to synthesize covalently cross-linked sulfonated polyimide membranes. 1,4,5,8-Naphthalenetetracarboxylic dianhydride, 2,2’-benzidine-disulfonic acid, 4-(4-aminophenoxy)benzene-1,3-diamine and 2-bis(4-(4-aminophenoxy)phenyl) hexafluoropropane-based cross-linked sulfonated polyimide membranes have been synthesized and compared with linear sulfonated polyimide membrane in terms of various fuel cell application parameters. Covalent cross-linking is a simple and efficient method to increase the lifetime of the polyelectrolyte membranes. The covalently cross-linked sulfonated polyimidemembranes show an ion exchange capacity of 1.426 1.441 meq.g-1, proton conduction of 0.026 – 0.031 S cm-1, and water uptake capacity 10.7 – 17.07%. As the triamine concentration is increases, both hydrolytic and oxidative stabilities of the membranes also increased. The linear sulfonated polyimide showed hydrolytic stability of 43 h, whereas hydrolytic stability of the cross-linked sulfonated polyimide membranes is increased up to 70 h.

中文翻译：

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4-(4-氨基苯氧基)苯-1,3-二胺基共价交联磺化聚酰亚胺作为燃料电池中的质子交换膜

当磺化聚酰亚胺膜用作燃料电池聚电解质膜时，它们的水解和氧化稳定性是一个重要的问题。为了提高磺化聚酰亚胺膜的水解和氧化稳定性，合成、表征了四胺交联剂 4-(4-氨基苯氧基)苯-1,3-二胺，并成功地用于合成共价交联的磺化聚酰亚胺膜。1,4,5,8-萘四甲酸二酐、2,2'-联苯胺-二磺酸、4-(4-氨基苯氧基)苯-1,3-二胺和2-双(4-(4-氨基苯氧基)苯基)六氟丙烷已经合成了基于交联的磺化聚酰亚胺膜，并在各种燃料电池应用参数方面与线性磺化聚酰亚胺膜进行了比较。共价交联是一种增加聚电解质膜寿命的简单有效的方法。共价交联的磺化聚酰亚胺膜的离子交换容量为 1.426 1.441 meq.g-1，质子传导为 0.026 – 0.031 S cm-1，吸水能力为 10.7 – 17.07%。随着三胺浓度的增加，膜的水解和氧化稳定性也增加。线性磺化聚酰亚胺的水解稳定性为 43 小时，而交联磺化聚酰亚胺膜的水解稳定性增加了 70 小时。随着三胺浓度的增加，膜的水解和氧化稳定性也增加。线性磺化聚酰亚胺的水解稳定性为 43 小时，而交联磺化聚酰亚胺膜的水解稳定性增加了 70 小时。随着三胺浓度的增加，膜的水解和氧化稳定性也增加。线性磺化聚酰亚胺的水解稳定性为 43 小时，而交联磺化聚酰亚胺膜的水解稳定性增加了 70 小时。