Russian Chemical Bulletin

, Volume 44, Issue 6, pp 1021–1026 | Cite as

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

  • V. N. Artem'eva
  • V. V. Kudryavtsev
  • P. I. Chupans
  • A. V. Yakimansky
  • G. V. Lubimova
Physical Chemistry

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 andEa 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.

Key words

H-complex polyimide diester of 3,3′,4,4′-benzophenonetetracarboxylic acid diamine 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • V. N. Artem'eva
    • 1
  • V. V. Kudryavtsev
    • 1
  • P. I. Chupans
    • 1
  • A. V. Yakimansky
    • 1
  • G. V. Lubimova
    • 1
  1. 1.Institute of Macromolecular CompoundsRussian Academy of SciencesSt. PetersburgRussian Federation

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