This article is cited in 6 papers

Mechanical properties, strength physics and plasticity

Study of the kinetics of the phase transition of the first order in tetracosane С$_{24}$Н$_{50}$ by Fourier-transform IR spectroscopy

V. A. Marikhin^a, S. A. Gur'Eva^a, L. P. Myasnikova^a, B. Z. Volchek^b, D. A. Medvedeva<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg

Abstract: The kinetics of the structural first order phase transition in the tetracosane С$_{24}$Н$_{50}$ monodisperse samples is studied with the help of FTIR spectroscopy. The temperature dependencies of the frequency and intensity of rocking ($\nu$ $\sim$ 720 cm$^{-1}$) and bending ($\nu$ $\sim$ 1470 cm$^{-1}$) vibrations of СН$_2$-groupes in the methylene trans-sequences in the crystalline cores of the elementary lamellae are investigated. It is shown that the first order solid phase transition is developing on a heterogeneous mechanism in the narrow temperature interval ($\Delta T\sim$ 2 K) according to the theory of the diffused first order phase transitions and is due to the crystalline cell symmetry change.

Keywords: $n$-alcanes, phase transitions,theory of diffuse phase transitions, IR spectroscopy.

Received: 06.05.2019
Revised: 06.05.2019
Accepted: 07.05.2019

DOI: 10.21883/FTT.2019.10.48256.470

 English version: Physics of the Solid State, 2019, 61:10, 1785–1789

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