Abstract
AbstractDielectric dispersion and absorption spectra of plasticized polyvinyl chloride systems were investigated in order to obtain information about the efficiency and compatibility of the plasticizer.Dielectric spectra were measured as a function of temperature at a constant frequency and a constant heating rate within the range of −170 to +150°C.The glass transition temperature [Tg] is found to be dependent on the quality (structure) and quantity of the plasticizer used. The dipole‐dipole interactions, and thus also the plasticizing effect, are characterized by the dielectric permittivity change [Δet] in the transitions range.Dielectric spectra of compounds prepared with either commercial or special‐type plasticizers were measured. The effect of the chemical structure on the dielectric spectra was studied on a series of compounds containing phthalate‐type plasticizers having alcoholic side chains of an increasing length. The results of dielectric measurements are compared with those obtained by standard mechanical tests.From this comparison of results it may be concluded that the investigation of dielectric spectra offers important information regarding the efficiency and compatibility of plasticizers.
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