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Free volume in two differently plasticized poly(vinyl schloride)s: a positron lifetime and PVT study
Dlubek, Günther ...
The temperature dependence of the specific volume, V, and of the mean size of local free volumes (holes), v[sub]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[sub]f=hV, and v[sub]h increase with the content of plasticizer. From the comparison of V and V[sub]f with v[sub]h the hole number per gram N'[sub]h is estimated. Other than v[sub]h, N'[sub]h does not depend on the temperature nor on the content of plasticizer.
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