“…53 In the copolymerisation with MMA, an opposite trend is observed. 158 In our opinion, the most correct approach to the study of structure ± activity relationships of vinylazoles in copolymerisation was proposed by Smirnov et al 54,144 Thus for the N-vinylazole Ð diethyl maleate (DEM) and N-vinylazole ± 1-vinylpyrrolidone (VPD) systems, the activities of the monomers in the reaction of vinylazoles with the DEM radical are the higher the higher is the polarity of the C=C bond and the negative charge of the b-carbon atom of the vinyl group of the vinylazole. In contrast, the activities of vinylazoles in the reaction with the VPD radical increase with a decrease in polarity and q b .…”