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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...
Dielectric and conduction properties of polyimides were evaluated on the basis of dielectric constant, dielectric loss, electric modulus and AC conductivity, and their variation with frequency and temperature. Polyimide films exhibited good insulating properties with dielectric constants values in the range of 2.78–3.48 and dielectric loss comprised between 0.01 and 0.03 at 1Hz at room temperature.
New polyimides have been synthesized by reaction of 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA) or/and 5-[2,5-(dioxotetrahydrofuryl)]-3-methyl-3-cyclohexen-1,2-dicarboxylic anhydride (DOCDA) with 4,4'-methylene dianiline (DDM). Polycondensation reactions were carried out in solution and resulting polyimides gave flexible free-standing films. The introduction of alicyclic moieties in...
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