Abstract
In the previous paper, the diffusion coefficients of plasticizers in the polyvinyl chloride compounds were reported, for the plasticizers, TCP, DOP and DOA, over the range of 20-140°C and 20-60 percent plasticizer. In this paper, the effects of plasticizer concentration and temperature were examined.Over 100°C, the diffusion coefficients were decided by the volume fraction of plasticizer, and there were little difference between plasticizers. At lower temperatures, the differences in plasticizer efficiencies appeared. Linearity could be found between logD and 1/T, where D is diffusion coefficient and T is absolute temperature, and activation energies increased rapidly as the plasticizer concentration decreased. By Eyring's theory on diffusion, the activation entropies were calculated.
