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Specificity of the Transformation of End Methyl Groups in the Interlamellar Regions of Tetracosane during the Solid-Solid Phase Transition as revealed by FTIR Spectroscopy
Russian version
DOI: 10.21883/PSS.2022.12.54398.462
Marikhin V. A.1, Gureva S. A.1, Vlasova E. N.2
1Ioffe Institute, St. Petersburg, Russia
2Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Email: v.marikhin@mail.ioffe.ru
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The kinetics of the development of the first-order diffuse structural phase transition in monodisperse samples of tetracosane C24H50 was studied by FTIR spectroscopy. The temperature dependences of the frequencies and intensities of the C-H-stretching vibrations in the spectral region ν=2800-3000 cm-1 were studied for 4 different modes in the methylene CH2 trans sequences of the main chain and for 4 different modes corresponding to the end methyl CH3-groups. Specific changes in the vibrational frequencies of all investigated modes are found, which are caused by changes in the symmetry of the molecular packing during the first-order phase transition. Keywords: n-alkanes, phase transitions, theory of diffuse phase transitions, IR spectroscopy.
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