2,2-BIS-[4-(3-AMINOPHENOXY)PHENYL]HEXAFLU OROPROPANE AND POLYIMIDES ON THEIR BASIS

The reaction between 2,2-bis-(4-hydroxyphenyl)hexafluoropropane and a twofold molar equivalent of m-dinitrobenzene in conditions of aromatic nucleophilic nitrosubstitution was used to prepare ,2-bis-[4-(3-nitro phenoxy)phenyl]hexafluoropropane which was subsequently reduced to 2-b is-[4-(3-aminophenoxy)phenyl]hexafluoropropane. Polycyclocondensation of this diamine with some dianhydrides of aromatic tetracarboxylic aci ds in m-cresol gave polyimides characterized by high thermal stability , good solubility in organic solvents, and comparatively low softening points. These properties account for the improved processibility of t he synthesized polyimides.