Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Glasses and Glass Transition I (joint session DY/CPP)
CPP 5.1: Hauptvortrag
Montag, 11. März 2013, 15:00–15:30, H34
Intra- and inter-molecular dynamics in glass-forming liquids — •Periklis Papadopoulos1, Wilhelm Kossack2, and Friedrich Kremer2 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Universität Leipzig, Germany
The intra- and inter-molecular interactions of salol and polystyrene, as low molecular weight and polymeric glass-forming model systems, are studied by Fourier-transform infrared (FTIR) spectroscopy and Broadband Dielectric Spectroscopy (BDS). By analysing the temperature dependencies of specific IR absorption bands it is demonstrated that each molecular moiety in the glass-formers has its own signature in the course of the dynamic glass transition: while some do not show any change at the calorimetric glass transition temperature, others exhibit a pronounced “kink”. The effects cannot be attributed solely to microscopic thermal expansion, but instead indicate gradual conformational changes. The ease of application of this approach to a variety of systems in different geometries and external conditions can assist the modelling of glasses and the understanding of the coupling between the glass transition and molecular-level dynamics.
[1] P. Papadopoulos, W. Kossack, and F. Kremer, Soft Matter, 2013, 9, 1600 - 1603