“…These changes must be understood in terms of the appearance of some of the ClCH=CH–, CH 2 =CCl–, and/or –CH=CCl– units as a result of the partial dehydrogenation of the PVC macromolecular chains, as shown in Scheme 1 . As shown in our previous study, the main IR bands of the GO sheets are situated at 1032, 1163, 1212, 1414, 1599, 1724, and 3594 cm −1 , and they are assigned to the vibrational mode of the stretching of C=C bonds, C–O in the ether group, OH groups, the deformation of OH and COOH groups, H 2 O molecules on the GO sheet surfaces, the stretching of C=O in COOH and CHO groups, and the stretching OH in the free H 2 O molecules, respectively [ 16 , 28 ]. According to Figure 4 c,d, as the GO sheet concentration in the PVC/GO composite mass increases, the following can be observed: (i) an increase in the absorbance of IR bands peaking at 1776 and 3319 cm −1 ; (ii) a change in the ratio of the absorbances of the bands localized in the spectral ranges of 600–750 and 2750–3250 cm −1 with the maxima of IR bands of high absorbance at 611 and 2920 cm −1 , from 1.28 (black curve in Figure 4 c) to 0.36 (blue curve in Figure 4 c) when the GO concentration is equal to 0 and 5 wt.%, respectively.…”