DIELECTRIC RELAXATION OF POLY(VINYL CHLORIDE)STABILIZED WITH DIBUTYLTIN LAURATE-MALEATE

摘要

The dipolar relaxation mechanisms ofpolyvinyl chloride stabilized with dibutyltin laurate-maleate have been studied by dielectric relaxation spectroscopy.The study was carried out in the frequency range 1 k-1 MHz at fixed temperatures above and below the glass transition temperature.The broadening of the loss peaks was considered because of the multiplicity of molecular conformations,which stablizer molecules can form.The results show a distinct broad relaxation process with activation energy of 0.5 eV.The dielectric strength increases with temperature and the origin of the relaxation was ascribed to the reorientation of the polar C-Cl and C=O groups.