Abstract
The dielectric and mechanical losses in the amorphous polar polymer poly(vinyl acetate) (PVA) are measured over wide ranges of frequencies and temperatures. It is established that the temperature dependence of the frequency of conformational transitions exhibits a nonlinear behavior (in the Arrhenius coordinates). This temperature dependence is used to determine the defreezing temperature of the conformational dynamics of PVA (∼300 K). The defreezing temperature appears to be close to the temperature of the quantum defreezing of one of the modes of the molecular dynamics of PVA (according to the Raman spectroscopic data). It is assumed that the revealed decrease in the barrier to conformational transitions with an increase in the temperature is associated with the weakening of the intermolecular interaction and the increase in freedom of adjustment of neighboring units in the vicinity of the conformational transitions due to the excitation of the molecular dynamics.
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Original Russian Text © A.I. Slutsker, Yu.I. Polikarpov, D.D. Karov, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 5, pp. 1028–1033.
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Slutsker, A.I., Polikarpov, Y.I. & Karov, D.D. Specific features of the temperature dependence of the conformational dynamics of polymers. Phys. Solid State 51, 1087–1092 (2009). https://doi.org/10.1134/S1063783409050308
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DOI: https://doi.org/10.1134/S1063783409050308