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Thermostable polyimides based on perylenetetracarboxylic dianhydride and aromatic diamines containing oxadiazole rings were prepared and thin films were made therefrom. Dark-red, opaque coatings resulted having strong adhesion to the glass support. The composition of these polyimide films was analysed using X-ray photoelectron spectroscopy (XPS). The dynamo-mechanical and dielectric behaviour of the...
Perylene‐containing copolyimides have been synthesized by one‐step polycondensation reaction under high temperature of two different aromatic diamines with a mixture of perylene‐3,4,9,10‐tetracarboxylic dianhydride (PTCDA) and 4,4'‐hexafluoroisopropylidene diphthalic anhydride (6FDA). The copolyimides were soluble in polar amidic solvents and their solutions gave flexible thin films when spread onto...
Heterocyclic polyimides based on bis (ketonaphthalic) dianhydrides and aromatic diamines containing oxadiazole rings were prepared and their dielectric properties were investigated. The dielectric constant values, measured at room temperature and in the frequency domain of 1 Hz-1MHz, were in the range of 2.7-3.1, being lower or comparable with those of commercial polyimide film Kapton which is one...
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