Physics of the Solid State
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Influence of conformational disorder on the development of solid-solid phase transitions in tetracosane
Gureva S. A. 1, Marikhin V. A. 1, Vlasova E. N. 2
1Ioffe Institute, St. Petersburg, Russia
2Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Email: swet.gurjewa@gmail.com, v.marikhin@mail.ioffe.ru

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The polymorphic transformations of tetracosane C24H50 upon heating were studied using Fourier transform infrared spectroscopy. A violation of the regularity of chains in the cores of the lamellae was revealed based on temperature changes in the progressions of rocking vibrations of CH2- groups and stretching (skeletal) vibrations of C-C- bonds. The occurrence of end gauche defects was discovered, the number of which increases at each transition between intermediate rotator phases (RI, RII, RV). A mechanism for structural rearrangements in tetracosane has been proposed. Keywords: n-alkanes, lamellae, phase transitions, rotator phases, IR spectroscopy.
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