Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 55: Posters - Soft Matter, Glasses
DY 55.6: Poster
Donnerstag, 23. März 2017, 17:00–19:30, P1A
Low temperature dielectric properties of the polymers poly(vinyl acetate) and poly(vinyl chloride) in the frequency range from Hz to MHz — •Marcel Schrodin, Annina Luck, Benedikt Frey, Lennart Singer, Andreas Reiser, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, 69120 Heidelberg
At low temperatures the behavior of amorphous solids is mainly governed by two level systems and described by the standard tunneling model. In the last years, considerable deviations were observed in dielectric measurements. These deviations are possibly due to the influence of long-range interactions between tunneling systems and the effect of nuclear electric quadrupole moments involved in such tunneling systems.
We show measurements of low temperature dielectric properties of the two amorphous polymers poly(vinyl acetate) and poly(vinyl chloride) in the frequency range from Hz to MHz. As poly(vinyl chloride) contains nuclear electric quadrupole moments due to the presence of the isotopes 35Cl and 37Cl, a possible influence of nuclear quadrupole moments on the dielectric properties can be investigated. In contrast, poly(vinyl acetate) has a similar basic structure but contains only atoms with no nuclear electric quadrupole moment, which enables a direct comparison between both polymers to get a further insight. In addition, both polymers contain large electric dipole moments due to polar side groups, which allows to look for possible effects of long-range interaction between tunneling systems.