Russian Chemical Bulletin

, Volume 67, Issue 10, pp 1831–1837 | Cite as

Phase state diagram of a poly(amic acid)–solvent–nonsolvent system

  • A. A. Shcherbina
  • V. K. Gerasimov
  • T. P. Semenov
  • A. E. Chalykh


Phase behavior and structure formation was studied using optical interferometry, nephelometry, and refractometry in the polymer–solvent–nonsolvent system for DMF solutions of two poly(amic acids): based on 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride and meta-phenylenediamine (PAA-1) and pyromellitic acid dianhydride and 4,4′-oxydianiline (PAA-2). Distilled water and its mixtures with DMF were used as a nonsolvent. According to the results of the study, isothermal cross sections of the phase state diagram in the threecomponent system were plotted, the position of the critical point, the spinodal, and the conodes were determined, the movement of the figurative points in the system was traced depending on the nonsolvent composition.

Key words

phase state diagram phase separation nonsolvent polymer solutions poly-(amic acid) 


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • A. A. Shcherbina
    • 1
    • 2
  • V. K. Gerasimov
    • 1
  • T. P. Semenov
    • 1
  • A. E. Chalykh
    • 1
  1. 1.A. N. Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussian Federation
  2. 2.D. I. Mendeleev University of Chemical Technology of RussiaMoscowRussian Federation

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