Investigation of polyimide formation from the complexes of the diester of benzophenonetetracarboxylic acid with diamines 7. Role of theo-carboxylic group of acid diester in the formation and imidization of H-complexes |
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Authors: | V N Artem'eva V V Kudryavtsev P I Chupans A V Yakimansky G V Lubimova |
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Institution: | (1) Institute of Macromolecular Compounds, Russian Academy of Sciences, 31 Bol'shoi prosp., 199004 St. Petersburg, Russian Federation |
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Abstract: | The kinetics of thermal imidization of various H-complexes of semiesters of bis(o-phthalic) acids with diamines was studied. The activation energy of the imidization was shown to increase with increasing pKa value of the diamine andE
a value of the dianhydride and with decreasing nucleophilicity of the alcohol used for the synthesis of H-complexes. The experimental kinetic data and the results of quantum chemical calculations of the heats of formation of the initial H-complexes and transition states made it possible to propose a mechanism for the imidization reaction. This mechanism takes into account the catalytic effect of the carboxylic group of the semiester in theo-position with respect to the ester group.For report 6, seeIzv. Akad. Nauk, Ser. Khim., 1993, 300 Russ. Chem. Bull., 1993,42, 255 (Engl. Transl.)].Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1060–1065, June, 1995. |
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Keywords: | H-complex polyimide diester of 3 3" target="_blank">gif" alt="prime" align="BASELINE" BORDER="0"> 4 4-benzophenonetetracarboxylic acid" target="_blank">gif" alt="prime" align="BASELINE" BORDER="0">-benzophenonetetracarboxylic acid diamine |
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