Physics of the Solid State
Volumes and Issues
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
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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