Abstract
The paper presents a comparative study on the structure of some polyvinyl alcohols used in PVC-S technology. The obtained data clearly showed that the degree of hydrolysis can be determined, with the same high precision through chemical method, IR and 13C-NMR spectra. The carbonyl content determined from the IR spectra also correlates with the carbonyl content determined from 13C-NMR spectra. A fast and reliable IR method for checking the degree of hydrolysis as technological support can be provided, the normalized carbonyl content determined from IR spectrum being linearly correlated with the degree of hydrolysis. Keywords: Polyvinyl alcohols, vinyl alcohol-vinyl acetate copolymers, IR spectra, 1H-NMR spectra, 13C-NMR spectra