An unsymmetrical heterocyclic diamine monomer containing proton donor (–NH–), 2-(4-aminophenyl)-5-aminobenzimidazole (PABZ), which can form hydrogen bond interactions with carbonyl functional group, was copolymerized with 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (TFMB) through two-step synthetic methods to obtain a series of homo- and co-polyimide (PI). The corresponding homo- and co-PI both exhibited good solubility in aprotic polar solvents, such as N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N,N-dimethylformamide, pyridine, and dimethyl sulfoxide. In addition, the PI-containing PABZ units showed excellent tensile strength ranging from 83 to 164 MPa, 130–260% higher than 6FDA/TFMB homo-PIa films. These PIs, especially PABZ/6FDA, showed very high glass transition temperatures, 430°C.

中文翻译：

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由于分子间氢键，一种具有高玻璃化转变温度和优异机械性能的可溶性聚酰亚胺的简便合成

含有质子供体（-NH-）、2-（4-氨基苯基）-5-氨基苯并咪唑（PABZ）的不对称杂环二胺单体与羰基官能团形成氢键相互作用，与4,4'-（六氟异亚丙基）共聚)二邻苯二甲酸酐 (6FDA) 和 2,2'-双(三氟甲基)-4,4'-二氨基联苯 (TFMB) 通过两步合成方法获得一系列均聚和共聚聚酰亚胺 (PI)。相应的均聚和共聚 PI 在非质子极性溶剂中均表现出良好的溶解性，如 N,N-二甲基乙酰胺、N-甲基-2-吡咯烷酮、N,N-二甲基甲酰胺、吡啶和二甲基亚砜。此外，含 PI 的 PABZ 单元显示出优异的拉伸强度，范围为 83 至 164 MPa，比 6FDA/TFMB 均质 PIa 薄膜高 130-260%。这些 PI，尤其是 PABZ/6FDA，显示出非常高的玻璃化转变温度，