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Polimeri : Plastics and Rubber Journal, Vol.30 No.4 April 2010. -

Phase behaviour of polyvinyl chloride PVC mixtures with plasticizer dioctyl-phthalate, di-2-ethylhexyl phthalate, DOP is determined by measuring dielectric permittivity under compressive stress. The dependence of the measured dielectric parameters on the composition of mixtures, temperature and stress has been determined. The DOP contents affect significantly all the properties of the mixtures. The increase in the contents of the DOP plasticizer shifts the relaxation spectrum to lower temperatures, and the increase of compressive stress, towards higher temperatures, and reduces also the intensity of glass transition. Since increasing pressure densifies the material, analogous to lowering the temperature, a non-linear dependence of relaxation transitions on pressure is also expected and observed as shift to higher temperatures.

dielectric properties; plasticizer; polyvinyl chloride PVC; compressive stress

Autor: Želimir JELČIĆ - ; PLIVA-Research and Development d.o.o., Zagreb Nives BRAJKOVIĆ - ; Elka Cable d.o.o. Ivica PERČULIJA - Rob



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