Fig. 4 shows the flotation results for the
PVC/PET mixtures treated with the alkaline solution
and next conditioned with the plasticizer
solution. It is clear from Fig. 4 that the temperature
of the solution during conditioning is an important
parameter. Flotation of the PVC is facilitated at
elevated temperatures. The results of flotation at
20°C are practically the same as observed for the
PVC/PET mixture treated only with the alkaline
solution. Although no fundamental study of plasticizer
adsorption was conducted here, it appears to