Experimental analysis demonstrates equivalent impacts of temperature and plasticizer concentration on diffusion in polyvinyl chloride, suggesting free-volume theory governs transport.
The diffusion of a plasticizer S 1 from a source made of PVC containing 25 wt% of S 1 into a medium made of PVC film containing another plasticizer S 2 in 15, 20, 25 and 30 wt%, was studied at temperatures ranging from 70 to 108°C. S 1 was generally diphenyl‐iso‐octyl phosphate (DPIP) and S 2 was dioctyl phthalate (DOP) but the reciprocal system was also studied in some cases. Starting from a reference point corresponding to a temperature of 70°C and a DOP concentration of 25 wt%, it was found experimentally that an increase Δ v of the DOP volume fraction ( v ) or an increase Δ T of the temperature, led to the same variation of the diffusion coefficient of DPIP if Δ T /Δ v ∼ 139K. A reasonably close value can be obtained from a simple free‐volume approach, using the literature data on the plasticizer action of DOP on PVC.
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Audouin et al. (1994) studied this question.
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