Diffusion Rates of Plasticizers in Polyvinyl Chloride Compounds

V. Relations to Second-order Transition Temperatures and Volume Resistivities of Compounds

Abstract

In the previous paper, the diffusion coefficients (D) of plasticizers in the polyvinyl chloride compounds were reported, for the plasticizers, TCP, DOP and DOA, over the range of 20-120°C, and 20-60 percent plasticizer. In this paper, the relations were examined between D and flex temperatures and volume resistivities of the compounds. The reciprocal of flex temperatures (Tf°K) is proportional to w₂, where w₂ is weight fraction of resin. If D was measured at over 100°C, linearity was found between 1/Tf and log D, but not linear at lower temperatures, and at 20°C, there seemed to exist a certain general relationship between them. A linear relationship, common to all plasticizers tested, was found between log (ρw₂) and log D, where ρ is the volume resistivity of the compound.