Dielectric Properties of PVC Plasticized with Dioctyl Sebacate (DOS)

The dielectric properties of PVC plasticized with dioctyl sebacate (DOS) was studied. The dielectric loss tangent was found to decrease for the plasticized samples which interpreted according to the increase in the intermolecular interactions upon plasticization. The plasticizer contribute to the dielectric strength not only via its own polarity but also by markedly changing the nature of the relaxation process. The calculated Frohlich-Kirwood "g" factor indicates that there is a strong interaction between the C-Cl group (of the polymer) and the C = O group (of the plasticizer).