Transient Current and Dielectric Relaxation in PVC Stabilized with Di-N-Octyltin-β-Mercaptopropionate

Abstract

DC current technique has been used to calculate the dielectric losses in PVC stabilized with di-n-octyltin-β-mercaptopropionate using Hamon approximation. Both the shift factor and William-Landel-Ferry relation were used to determine the glass transition temperature of the prepared sample. It was found that the loss caused by the dielectric relaxation predominates below Tg whereas that caused by the dc conduction predominates at higher temperature. The obtained α-relaxation was attributed to the cooperative motion of the C‒Cl dipoles (of the polymer) and the C = O (of the stabilizer).