Abstract
The synthesis of aromatic poly(ether imide)s containing 4,5-diazafluorene units in the polymer backbone is described. 9,9-di[4-(4-Aminophenoxy)phenylene]-4,5-diazafluorene (3), which was used as a new monomer, was synthesized with 4,5-diazafluoren-9-one as the starting material. This diamine monomer was employed in reactions with a variety of aromatic dianhydrides to furnish poly(ether imide)s. These 4,5-diazafluorene-based polymers showed solubility in polar amidic solvents such as NMP, DMAc and DMF, good optical transparency, and high thermal stability. The glass transition temperatures (Tg) of these poly(ether imide)s were recorded between 325 and 356°C with the help of differential scanning calorimetry (DSC), and the Tg determined by dynamic mechanical thermal analyses (DMA) stayed in the range of 329–363°C, and the 10% weight-loss temperatures all occurred above 560°C in both nitrogen and air atmospheres. In addition, the flexible polyimide films possessed tensile strengths in the range of 64–101MPa, tensile modulus of 1.8–2.1GPa, and elongations at break of 6–13%.
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