V. V. Korshak, G. Tseitlin, A. Pavlov
Aug 1, 1968
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Influential Citations
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Journal
Russian Chemical Bulletin
Abstract
1. Pyrazine tetracarboxylic acid was synthesized by the oxidation of phenazine, and on treatment with acetic anhydride gave a dianhydride. 2. The condensation of pyrazine tetracarboxylic acid anhydride with 4,4′-diaminodiphenyl ether in dimethylformamide solution led to the synthesis of a polyamidoacid, soluble in amide type solvents. 3. By thermal treatment of polyamidoacid films under vacuum a polyimide was obtained having a decomposition point in air beginning at ∼350°.