Abstract
The temperature dependences of the transverse expansion ɛ⊥(T) and the longitudinal contraction ɛ‖(T) (with respect to the axes of chain molecules) in large-sized poly(ethylene) (PE) crystal grains (100×60×60 nm) are measured using x-ray diffraction in the temperature range 5–380 K. The temperature dependence of the elongation of the molecular skeleton ɛC(T) is obtained by Raman spectroscopy. It is found that the dependences ɛ⊥(T), ɛ‖(T), and ɛC(T) exhibit a similar specific nonlinear behavior. Analysis of these dependences indicates that the nonlinearity is associated with the quantum statistics of transverse vibrations. The energies and amplitudes of zero-point (at T=0) transverse (torsional and bending) vibrations and the relevant zero-point components ɛ‖(0) and ɛC(0) are estimated. It is revealed that the zero-point components make a considerable contribution to the dynamics of the PE crystal up to the melting temperature (∼400 K).
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Translated from Fizika Tverdogo Tela, Vol. 44, No. 10, 2002, pp. 1847–1854.
Original Russian Text Copyright © 2002 by Slutsker, Vettegren, Gilyarov, Dadobaev, Kulik, Titenkov.
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Slutsker, A.I., Vettegren, V.I., Gilyarov, V.L. et al. Manifestation of quantum statistics in vibrational dynamics of poly(ethylene) crystals. Phys. Solid State 44, 1936–1943 (2002). https://doi.org/10.1134/1.1514784
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DOI: https://doi.org/10.1134/1.1514784