synthetic routes. Then, they were polymerized with 4,4′-oxydiphthalic anhydride, 3,3′,4,4′-benzophenone tetracarboxylic dianhydride, and 2,2′-bis(3,4-dicarboxyphenyl)-hexafluoropropane dianhydride to form a series of fluorinated polyimides via a conventional two-step thermal or chemical imidization method. The resulting polyimides were characterized by measuring their solubility, viscosity, mechanical properties
带有醚-酮基团的两种芳香族不对称二胺,即3-
氨基-4'-(4-
氨基-2-三
氟甲基苯氧基)-
二苯甲酮和4-
氨基-4'-(4-
氨基-2-三
氟甲基苯氧基)-
二苯甲酮,成功地用两种不同的合成路线合成。然后,将它们与4,4'-氧基二
邻苯二甲酸酐,3,3',4,4'-
二苯甲酮四
羧酸二酐和2,2'-双(3,4-二羧苯基)-
六氟丙烷二酐聚合。通过常规的两步热或
化学酰亚胺化方法得到
氟化聚
酰亚胺。通过测量它们的溶解度,粘度,机械性能,IR-FT和热分析来表征所得的聚
酰亚胺。结果表明,聚
酰亚胺的固有粘度为0.48–0.68 dl / g,易于溶解在双极性溶剂和常见的低沸点溶剂中。同时,所得的坚固而柔软的聚
酰亚胺薄膜表现出出色的热稳定性,例如,分解温度(失重10%时)高于575°C,
玻璃化转变温度在218-242°C的范围内。聚合物薄膜还显示出出色的机械性能,例如86.5–132.8 MPa的拉伸强度,8–14%的断裂伸长率和1