Study of thermochemical conversions of alicyclic polyimides |
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Authors: | B A Zhubanov M B Leonova G M Mirkarimova |
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Institution: | (1) Institute of Chemical Sciences, Academy of Sciences of the Kazakh S.S.R., Alma-Ata, U.S.S.R. |
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Abstract: | The thermochemical conversions of certain polyimides obtained by the polycondensation of dianhydrides of alicyclic tetracarboxylic acids and 4,4-diaminodiphenyl oxide were studied by different methods of thermal analysis (thermogravimetry, mass-spectrometric evolved gas analysis, and pyrolytic gas chromatography). The thermal dissociation of dianhydride fragments according to the reverse reaction of retrodiene synthesis is the basic reaction that determines the thermal stabilities of the polymers studied. It is shown that the absence of endoethylene bonding or its substitution by oxygen in the dianhydride fragments leads to increases in the thermal stabilities of alicyclic polyimides.
Zusammenfassung Thermochemische Umwandlungen einiger Polyimide, die durch Polykondensation der Dianhydride alicyclischer Tetracarbonsäuren mit 4,4 -Diaminodiphenyloxid dargestellt waren, wurden durch verschiedene thermoanalytische Methoden (TG, massenspektrometrische EGA und Pyrolyse-Gaschromatographie) untersucht. Die thermische Spaltung der Dianhydrid-Komponente nach einer Retro-Diensynthese ist die Hauptreaktion, die die thermische Stabilität der Polymeren bestimmt. Bei Abwesenheit der endo-Ethylen-Bindung in der Dianhydrid-Komponente oder Substitution durch eine Etherbindung wird die thermische Stabilität von Polyimiden mit alicyclischen Baugruppen erhöht.
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, ![pcy](/content/j63473124l31rk55/xxlarge1087.gif) ![Rcy](/content/j63473124l31rk55/xxlarge1056.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![Vcy](/content/j63473124l31rk55/xxlarge1042.gif) ![Ocy](/content/j63473124l31rk55/xxlarge1054.gif) ![lcy](/content/j63473124l31rk55/xxlarge1083.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![Ucy](/content/j63473124l31rk55/xxlarge1059.gif) ![Vcy](/content/j63473124l31rk55/xxlarge1042.gif) ![IEcy](/content/j63473124l31rk55/xxlarge1045.gif) ![lcy](/content/j63473124l31rk55/xxlarge1083.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![CHcy](/content/j63473124l31rk55/xxlarge1063.gif) ![IEcy](/content/j63473124l31rk55/xxlarge1045.gif) ![Ncy](/content/j63473124l31rk55/xxlarge1053.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![tcy](/content/j63473124l31rk55/xxlarge1090.gif) ![IEcy](/content/j63473124l31rk55/xxlarge1045.gif) ![Rcy](/content/j63473124l31rk55/xxlarge1056.gif) ![Mcy](/content/j63473124l31rk55/xxlarge1052.gif) ![Ocy](/content/j63473124l31rk55/xxlarge1054.gif) ![Ucy](/content/j63473124l31rk55/xxlarge1059.gif) ![scy](/content/j63473124l31rk55/xxlarge1089.gif) ![Ocy](/content/j63473124l31rk55/xxlarge1054.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![CHcy](/content/j63473124l31rk55/xxlarge1063.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![Vcy](/content/j63473124l31rk55/xxlarge1042.gif) ![Ocy](/content/j63473124l31rk55/xxlarge1054.gif) ![scy](/content/j63473124l31rk55/xxlarge1089.gif) ![tcy](/content/j63473124l31rk55/xxlarge1090.gif) ![pcy](/content/j63473124l31rk55/xxlarge1087.gif) ![Ocy](/content/j63473124l31rk55/xxlarge1054.gif) ![lcy](/content/j63473124l31rk55/xxlarge1083.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![Mcy](/content/j63473124l31rk55/xxlarge1052.gif) ![Icy](/content/j63473124l31rk55/xxlarge1048.gif) ![Dcy](/content/j63473124l31rk55/xxlarge1044.gif) ![Ocy](/content/j63473124l31rk55/xxlarge1054.gif) .
The authors would like to thank Yu. A. Sazanov and L. A. Shibaev (IVS AN SSSR, Leningrad) for help in the mass-spectrometric thermal analysis of the polymers. |
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