Abstract
The kinetics of the development of a diffuse phase transition of the first kind in monodisperse samples of tetracosan C24H50 was studied by FT-IR spectroscopy.The temperature dependences of the frequencies and intensities of 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 packing of molecules during a phase transition of the first order.
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