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Low-frequency librational vibrations, boson peak, and interchain interactions in a vitreous polymer

  • Polymers and Liquid Crystals
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Abstract

The IR and Raman spectra of plasticized poly(methyl methacrylate) (PMMA) are measured and analyzed in the frequency range 10–120 cm−1, in which the absorption and scattering due to the individual (85–90 cm−1) and correlated librational vibrations (15–20 cm−1, boson peak) preceding the appearance of relaxation dynamics manifest themselves. It is demonstrated that the presence of the boson peak as an indication of the solid-state behavior of the polymer material in the low-frequency spectra is associated with the correlation of librational vibrations not only inside macromolecules (in segments corresponding in length to the Kuhn segment) but also in segments of neighboring chains.

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Authors and Affiliations

  1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    V. A. Ryzhov & V. A. Bershtein

Authors
  1. V. A. Ryzhov
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  2. V. A. Bershtein
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Correspondence to V. A. Ryzhov.

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Original Russian Text © V.A. Ryzhov, V.A. Bershtein, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 10, pp. 1901–1905.

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Ryzhov, V.A., Bershtein, V.A. Low-frequency librational vibrations, boson peak, and interchain interactions in a vitreous polymer. Phys. Solid State 50, 1985–1990 (2008). https://doi.org/10.1134/S1063783408100326

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