Berlin 2005 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 8: Gl
äser II (gemeinsam mit FV DY)

DF 8.5: Vortrag

Montag, 7. März 2005, 15:15–15:30, TU A060

Viaolation of the Frequency Temperature Superposition — •Oliver Baldus and Ernst Roessler — Universität Bayreuth, Lehstuhl für Experimentalphysik II, 95440 Bayreuth

Meth-Tricresylphosphate (m-TCP) was studied in mixtures with different polystyrenes. By carrying out 31P-NMR on m-TCP and 2D-NMR on polystyrene and using deuterated polystyrene we were able to investigate each component of the mixture independently. Two-phase spectra consisting out of a superposition of a solid state spectrum and a Lorentzian line were not only obtained for the small component (m-TCP) but also for deuterated polystyrenes of different chain length. That indicates that the dynamical distribution of reorientational jump times broadens in mixtures even for the large component in comparison to neat polystyrene. Therefore the frequency temperature superposition cannot be applied in those mixtures.