Investigation of the Rotation of Molecular Groups in Polymers of Methyl Acrylate and Vinyl Acetate by the Method of IR-Spectroscopy

摘要

Absorption spectra are given for polymethyl acrylate and polyvinyl acetate in the areas of C-O stretching vibrations, measured at 77 and 295 K. In the range of frequencies of 1100-1300/cm a wide intensive band of absorption is found, the contour of which changes with temperature. Following the separation of this band into components (there turned out to be six) and comparing the behavior of the individual components when the temperature is changed, a conclusion was made concerning the presence of polymethyl acrylate of rotational isomerism in the ester group. In polyvinyl acetate in the same range of frequencies there is one wide band of absorption, the contour of which does not change with a change of temperature.