2.3. Preparation of flexible PVC compounds
The flexible PVC compounds (Table 2 ) were obtained by
employing an internal mixer Brabender Plastograph with a cham-ber of 30 cc. A dry blend of PVC resin (PVC K70) with plasticizer
(degraded PET products and/or DEHP) and thermal stabilizer (Ca/
Zn stearate) was prepared and added into the chamber in a single
step; after several trials, the best plasticization condition was
6 min as plasticization time at 180 C and 50 rpm. The degraded
PET products were used as obtained from the glycolysis reaction
without further purification steps.