Abstract
The temperature dependence of the specific volume, V, and of the mean size of local free volumes (holes), v h, of poly(vinyl chloride) containing 10 wt% (PVC-h) and 30 wt% (PVC-s) of the plasticizer di- n-butyl phthalate (DBP) were studied by pressure–volume–temperature (PVT) and positron annihilation lifetime spectroscopy (PALS) experiments. Using the Simha–Somcynsky equation-of-state, the hole fraction h was calculated from the PVT data. It was found that the thermal expansivity of the specific volume V, the specific free volume V f= hV, and v h increase with the content of plasticizer. From the comparison of V and V f with v h the hole number per gram N′ h is estimated. Other than v h, N′ h does not depend on the temperature nor on the content of plasticizer.
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