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Conformational sensitivity of tricosane absorption band progressions to polymorphic transformations
Gureva S. A.
1, Marikhin V. A.
1, Borisov A. K.
1, Vlasova E. N.
2
1Ioffe Institute, St. Petersburg, Russia
2Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
2Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Email: swet.gurjewa@gmail.com, borisov.ak@mail.ioffe.ru
The polymorphic transformations of monodisperse tricosane n-C23H48 upon heating were studied using FTIR spectroscopy. A disruption of chain regularity in the lamellae cores was revealed based on temperature-induced changes in the progressions of rocking vibrations of CH2 groups and stretching (skeletal) vibrations of C-C bonds. Thermal activation of various types of conformational defects, located predominantly at the chain ends, was observed. It was established that an increasing number of conformational defects facilitates crystal structure rearrangements upon heating, including transitions between intermediate rotator phases (RV, RI, RII). Keywords: n-alkanes, IR spectroscopy, phase transitions, rotator phases.
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