Fig. 4

¹³C NMR spectrum of PVA dispersion. 169.71 ppm—carbonyl side groups in side chains of vinyl acetate units; 68.4–63.3 ppm—chain methine groups in acetate and alcohol units; 46.5–44.0 ppm—chain methylene groups in alcohol units; 39.52 ppm—solvent; 42.3–35.0 ppm—chain methylene groups in acetate units (overlapped with the solvent peak); 20.73 ppm—methyl groups in side chains of vinyl acetate units. Molar content of alcohol units \([ {\text{OH]}}\) was calculated as \([{\text{OH}}] = \frac{{{\text{I}}(46.5 - 44.0)}}{{{\text{I}}(46.5 - 44.0) + {\text{I}}({\text{Ac}})}}\) where I(46.5−44.0)] is integral intensity of peaks corresponding to alcohol units and I(Ac) is the intensity of peaks at 169.71 or 20.73 ppm corresponding to carbonyl or methyl groups respectively, giving the result of [OH] about 12 % in both cases