Temperature dependence of -OH band in vinyl chloride:vinyl acetate:vinyl alcohol terpolymer

IR absorption studies of vinyl chloride:vinyl acetate:vinyl alcohol (VC:VAc:VA) terpolymers in the range 4000-400 cm^-1 at temperatures of 298, 323, 348, 373 and 398 K show a broad -OH band at ~3460 cm^-1 with a kink at its shoulder on the higher frequency side at ~3580 cm^-1. The IR spectra of the films treated at 323 and 348 K show a decrease in the magnitude of the band at ~3460 cm^-1 with a slight increase in the magnitude of the band at ~3580 cm^-1. The IR spectra of films treated at 373 and 398 K show, besides a shift in the sharp band toward the higher frequency side, an increase in its magnitude, whereas the broad band (at ~3460 cm^-1) continues to decrease in magnitude with the rise of temperature. The analysis of these bands and their temperature dependence are reported