The set of important properties of polymers necessary for their use as fuel cell membranes, such as film-forming properties, stability in acidic aqueous media, thermal stability, proton conductivity, is determined by their chemical structure, which provides not only basic and fragmentary mobility of the polymer chain but also complex supramolecular structural features (in particular, phase separation). The effect of the chemical structure of aromatic polyimide sulfonic acids, containing a fragment of 4,4^′-diamino[1,1^′-biphenyl]-2,2^′-disulfonic acid (BDSA), on their membrane-forming properties is discussed, as well as the membrane stability under the conditions of a hydrogen-air fuel cell. The research is aimed at investigating sulfonated polyimides based on the commercially available rigid monomer - BDSA and flexible dianhydrides with an electron donor in their structure. As a model for this study, two aromatic anhydrides with flexible -O- bonds were chosen for investigating the potential of corresponding polyimide films in application to proton exchange membranes. The synthesized sulfonic acid polyimide BDSA-SPI-4(H) is of interest as a proton-conducting membrane polymer for direct energy conversion electrochemical devices and has shown to be a promising material for this group of devices. It is suggested that the presence of the flexible electron donor bonds in the structure of dianhydride should increase the stability of the membranes prepared from BDSA. The properties of polyimide sulfonic acids from the aforementioned diamine and dianhydrides of different fragmentary flexibility implemented in this work could help the understanding of the connection between chemical structure and properties of the material in application to proton exchange membranes development.

聚合物用作燃料电池膜所必需的一组重要特性，例如成膜特性、在酸性水介质中的稳定性、热稳定性、质子传导性，是由它们的化学结构决定的，它不仅提供基本的和零碎的流动性聚合物链的复杂性以及复杂的超分子结构特征（特别是相分离）。芳香族聚酰亚胺磺酸化学结构的影响，含有4,4'-二^氨基[1,1'-联苯^] -2,2 ^'片段-二磺酸（BDSA），讨论了它们的成膜性能，以及氢-空气燃料电池条件下的膜稳定性。该研究旨在研究基于市售刚性单体 BDSA 的磺化聚酰亚胺和在其结构中具有电子供体的柔性二酐。作为本研究的模型，选择了两种具有柔性-O-键的芳族酸酐来研究相应聚酰亚胺薄膜在质子交换膜中的应用潜力。合成的磺酸聚酰亚胺 BDSA-SPI-4(H) 作为一种用于直接能量转换电化学装置的质子传导膜聚合物是令人感兴趣的，并且已被证明是用于这组装置的一种有前途的材料。建议在二酐结构中存在柔性电子供体键应增加由 BDSA 制备的膜的稳定性。在这项工作中实施的来自上述二胺和不同片段柔韧性的二酐的聚酰亚胺磺酸的性质有助于理解在质子交换膜开发中应用材料的化学结构和性质之间的联系。