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Nanotechnikum |
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Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4, D-06120 Halle, Germany
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G. Dlubek, V. Bondarenko, I. Y. Al-Qaradawi, D. Kilburn, R. Krause-Rehberg
The structure of the free volume in poly(styrene-co-acrylonitrile) from positron lifetime and pressure vvolume temperature (PVT) experiments II. Local free volume from positron annihilation lifetime spectroscopy (PALS)
Macromol. Chem. Phys. 205 (2004), 512-522
The structure of the free volume and its temperature dependence between 25 and 190 ?C of copolymers of styrene with acrylonitrile, SAN (0 to 50 mol-% AN), is studied by pressure volume temperature (PVT) experiments and positron annihilation lifetime spectroscopy (PALS). In this first part of the work, PVT data are reported which were analysed with the Simha-Somcynsky equation of state (S-S eos) to estimate the volume fraction of holes, h, which constitute the excess free volume. The temperature and pressure dependence of the specific volume V, the specific occupied and free volume, Vocc = (1 -
Keywords: positron annihilation, polymers
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