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Modification of the Microstructure of PTFE in a Supercritical Fluid

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Abstract

The influence of polytetrafluoroethylene (PTFE) processing in sc-CO2 and sc-PFO above the melting point on the microstructure and characteristics of phase transitions is studied using high-resolution scanning electron microscopy and differential scanning calorimetry (DSC). It is shown that, depending on the crystallization conditions, after the processing of PTFE in the supercritical fluid, the formation of a microstructure with a radial orientation of fibrils atypical for this polymer is possible. The processing of PTFE in the supercritical fluid leads to an irreversible increase in the heat of melting and crystallization and, accordingly, to an increase in the degree of crystallinity by 1.5–2 times compared to the initial values. The growth in the crystallinity is explained by a change in the microstructure of the PTFE melt in the supercritical fluid: the release of a part of segments of macromolecules from physical knots during the process of swelling and plasticization of the polymer matrix. Disentanglement of such knots that limit molecular mobility contributes to an increase in the number of macromolecular units involved in the formation of crystalline domains and to an irreversible increase in the degree of crystallinity.

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ACKNOWLEDGMENTS

We are grateful to Researcher of the Department of Polymers and Crystals, Faculty of Physics, Moscow State University, Ph.D. M. S. Kondratenko; Associate Professor of the Department of Polymers and Crystals, Faculty of Physics, Moscow State University, Dr. Sci. M. O. Gallyamov; General Director of Limited Liability Company “Mineral” M. A. Arkhipov; Senior Researcher of Limited Liability Company “NPP Arflon” S. A. Serov for help in preparing the experiment and discussion of the results.

Funding

The study was supported by the Ministry of Science and Higher Education as a part of the State Assignment of the Federal Scientific Research Center “Crystallography and Photonics” of the Russian Academy of Sciences.

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Authors and Affiliations

  1. OOO “NPP Arflon”, 109456, Moscow, Russia

    S. A. Khatipov, N. V. Sadovskaya & R. S. Khatipov

  2. Federal Research Center “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia

    N. V. Sadovskaya & A. S. Avilov

  3. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    V. M. Buznic

Authors
  1. S. A. Khatipov
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  2. N. V. Sadovskaya
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  3. A. S. Avilov
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  4. R. S. Khatipov
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  5. V. M. Buznic
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Correspondence to S. A. Khatipov or N. V. Sadovskaya.

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Translated by S. Rostovtseva

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Khatipov, S.A., Sadovskaya, N.V., Avilov, A.S. et al. Modification of the Microstructure of PTFE in a Supercritical Fluid. J. Surf. Investig. 16, 1150–1158 (2022). https://doi.org/10.1134/S1027451022060404

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