Berlin 2001 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 18: Poster: Polymer Blends, Heterogeneous Systems, Colloids and Nanoparticles, Interfaces, Polyelectrolytes
CPP 18.33: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT1
The Local Free Volume, and Ionic Conductivity in a Polymer Electrolyte — •G. Dlubek1, D. Bamford2, A. Reiche3, M. A. Alam2, W. Meyer4, and 5 — 1ITA Inst. f. innov. Technol. GmbH, Wiesenring 4, D-06210 Lieskau (Halle/S.) — 2H.H.Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK — 3Martin-Luther-Universitaet Halle-Wittenberg, Inst. f. Techn. u. Makrom. Chemie, Geusaer Str., D-06217 Merseburg — 4Max-Planck-Institut fuer Polymerforschung, D-55128 Mainz — 5
The size of free-volume holes in poly((ethylene glycol)23 dimethacrylate) without and with 0.6 mol/kg LiCF3SO3 is studied as a function of the temperature in the range 100 K to 370 K using positron annihilation lifetime spectroscopy (PALS). Below Tg = 240 K the hole volume of the polymer electrolyte is larger than in the neat polymer, while in the rubbery phase the situation reverses. Starting from the free-volume theory of Cohen-Turnbull, the ionic conductivity sigma is correlated with the mean hole volume v. A linear relation between log(sigma) and 1/v was observed to be valid for a variation of sigma over six orders of magnitudes. The VTF parameters and activation volume were determined.