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Free volume in two differently plasticized poly(vinyl chloride)s: a positron lifetime and PVT study |
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| Authors: | G. Dlubek V. BondarenkoJ. Pionteck M. Supej A. WutzlerR. Krause-Rehberg |
| Affiliation: | a ITA Institut für innovative Technologien GmbH, Köthen, Außenstelle Halle, Wiesenring 4, D-06120 Lieskau (bei Halle/S), Germany b Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, D-06099 Halle/S, Germany c Institut für Polymerforschung e.V., Hohe Strasse 6, D-01069 Dresden, Germany d Institut für Polymerwerkstoffe e.V., Geusaer Straße, Gebäude 131, D-06217 Merseburg, Germany |
| Abstract: | The temperature dependence of the specific volume, V, and of the mean size of local free volumes (holes), vh, 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 Vf=hV, and vh increase with the content of plasticizer. From the comparison of V and Vf with vh the hole number per gram N′h is estimated. Other than vh, N′h does not depend on the temperature nor on the content of plasticizer. |
| Keywords: | Specific volume Free volume Positron annihilation |
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