Abstract
The results of investigations on the effect of macromolecular interactions in dilute solutions upon the mobility of solvent molecules, observed in the low frequency Raman range ( 8 cm −1 < δ v 50 cm −1 ), are reported. Both polarized (VV) and depolarized (VH) components of the scattered light were measured in order to detect the joint effect of the correlated anisotropy fluctuations and intermolecular vibrations. Three frequency ranges were observed in the spectra, characterized by different relaxation times attributed to different types of the solvent molecules mobility. The effect of the structure of polymer side groups on the increase in the relaxation time, τ 1, measured in the range 8 < δ v < 30 cm −1 was observed. These interactions are considerably weaker in solutions of polyetherester with a rigid backbone than those occurring in solutions of flexible macromolecules with mesogenic side groups.
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