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Low-temperature study of ultradisperse polytetrafluoroethylene

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Abstract

The temperature behavior of the IR and EPR spectra of the industrial polytetrafluoroethylene F-4 sample and ultradisperse polytetrafluoroethylene (UPTFE) sample obtained by the thermogas dynamic method has been studied. It is shown that the spiral-chain conformation is preserved for both structures and that ordering tends to increase at lower temperatures. The IR spectral parameters of UPTFE were found to change irregularly at 273 K and 233 K due to a rearrangement of the crystalline component of the polymer. The observed temperature changes in the EPR spectra of the middle radicals in the samples are caused by gradual freeze-out of the molecular motions in UPTFE to a temperature ∼25° lower than in F-4, due to differences in the molecular and supramolecular structures of the samples.

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Authors and Affiliations

  1. Institute of Chemistry, Far East Division, Russian Academy of Sciences, Vladivostok

    L. N. Ignatieva & V. G. Kuryavyi

  2. Institute of Physicochemical Problems of Ceramic Materials, Russian Academy of Sciences, Russia

    V. M. Bouznik

Authors
  1. L. N. Ignatieva
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  2. V. G. Kuryavyi
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  3. V. M. Bouznik
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Correspondence to L. N. Ignatieva.

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Original Russian Text Copyright © 2007 by L. N. Ignatieva, V. G. Kuryavyi, and V. M. Bouznik

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Translated from Zhurnal Strukturnoi Khimii, Vol. 48, No. 4, pp. 693–697, July–August, 2007.

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Ignatieva, L.N., Kuryavyi, V.G. & Bouznik, V.M. Low-temperature study of ultradisperse polytetrafluoroethylene. J Struct Chem 48, 642–646 (2007). https://doi.org/10.1007/s10947-007-0097-6

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  • DOI: https://doi.org/10.1007/s10947-007-0097-6

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