Abstract 4-(4-Diphenylphosphino)phenyl-2,6-bis(4-aminophenyl)pyridine, as a novel aromatic diamine, was synthesized from 4-(diphenylphosphino)benzaldehyde and 4-nitroacetophenone through two-step, Chichibabin and reduction reaction successively. A series of aromatic polyimides containing pyridine and triphenylphosphine groups were prepared from this diamine with five dianhydrides via a conventional two-step thermal imidization procedure. These resulting polyimides were amorphous and showed good solubility in common polar solvents, such as N-methyl-2-pyrrolidone and N,N-dimethylacetamide. They exhibited outstanding thermal stability with glass transition temperature of 288–380 °C, 5% weight loss temperature of 521–583, and more than 60% residue at 800 °C under nitrogen. They also showed excellent flame retardancy with limited oxygen index value of 40–45. Tough and flexible polymer films had good mechanical properties with tensile strength of 69.1–128.6 MPa, tensile modulus of 1.7–2.1 GPa, and elongation at break of 7.2–25.7%, as well as high optical transparency with the UV cutoff wavelength in the 390–410 nm range. Graphical Abstract

中文翻译：

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衍生自 4-(4-二苯基膦基)苯基-2,6-双(4-氨基苯基)吡啶和各种芳族二酐的新型可溶性和热稳定聚酰亚胺

摘要 4-(4-二苯基膦基)苯基-2,6-双(4-氨基苯基)吡啶是一种新型芳香族二胺，以4-(二苯基膦基)苯甲醛和4-硝基苯乙酮为原料，通过两步法、奇巴宾和还原反应合成。依次。一系列含有吡啶和三苯基膦基团的芳族聚酰亚胺是通过传统的两步热酰亚胺化程序由这种二胺和五个二酐制备的。这些所得聚酰亚胺是无定形的，在常见的极性溶剂中表现出良好的溶解性，例如 N-甲基-2-吡咯烷酮和 N,N-二甲基乙酰胺。它们表现出出色的热稳定性，玻璃化转变温度为 288-380 °C，5% 的失重温度为 521-583，在氮气下 800 °C 下残留超过 60%。它们还表现出优异的阻燃性，有限的氧指数值为 40-45。坚韧而柔韧的聚合物薄膜具有良好的机械性能，拉伸强度为 69.1-128.6 MPa，拉伸模量为 1.7-2.1 GPa，断裂伸长率为 7.2-25.7%，并且在 390 的紫外截止波长下具有高光学透明度–410 纳米范围。图形概要