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Complexes of amic acids with polar aprotic solvents

VIII. Nonisothermal kinetics of solid-phase cyclodehydration of polyamic acids

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Abstract

The nonisothermal kinetics of solid-phase cyclodehydration of poly(4,4'-oxydiphenylene) pyromellitamic acid has been investigated with the aid of mass-spectrometric thermal analysis. It was established that depending on the method of preparation of the samples, the kinetics of cyclization vary from the polychromatic (film) to the monochromatic (fiber) kinetics. The possibility of the catalysis of the process as a result of the formation of complexes between the polymer and imidazole and its substituents is shown.

Zusammenfassung

Mittels massenspektrometrischer Thermoanalyse wurde die nichtisotherme Kinetik der Cyclodehydratation von Poly(4,4'-Oxydiphenylen)pyromellithsäure im festen Zustand untersucht. Es wurde festgestellt, daß die Cyclisationskinetik in Abhängigkeit vom Herstellungsverfahren der Proben von polychromatisch (Film) bis monochromatisch (Fiber) variiert. Die Möglichkeit der Katalyse des Vorganges infolge von Komplexbildung zwischen Polymer und Imidazol und seiner Substituenten wird gezeigt.

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Authors and Affiliations

  1. Institute of Macromolecular of Compounds of the Academy of Sciences of the USSR, Leningrad, USSR

    N. G. Stepanov, L. A. Shibaev & Yu. N. Sazanov

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  1. N. G. Stepanov
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  2. L. A. Shibaev
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  3. Yu. N. Sazanov
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Stepanov, N.G., Shibaev, L.A. & Sazanov, Y.N. Complexes of amic acids with polar aprotic solvents. Journal of Thermal Analysis 36, 559–568 (1990). https://doi.org/10.1007/BF01914509

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  • DOI: https://doi.org/10.1007/BF01914509

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