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DY: Fachverband Dynamik und Statistische Physik

DY 82: Glasses and Glass Transition (joint session DY/CPP)

DY 82.9: Vortrag

Freitag, 16. März 2018, 12:15–12:30, BH-N 334

Glassy dynamics as reflected in its inter- and intra-molecular interactions — •Friedrich Kremer, Wilhelm Kossack, and Markus Anton — Institute of Experimental Physics I, University of Leipzig, Linnéstr. 5, 04103 Leipzig, Germany

The inter- and intra-molecular interactions of low molecular weight and polymeric glass-forming model systems are studied by Broadband Dielectric (BDS) - and Fourier-Transform Infrared (FTIR) - Spectroscopy. Analyzing the temperature dependencies of specific IR absorption bands, reflecting the intramolecular potentials of dedicated molecular moieties, enables one to unravel on an intramolecular scale the process of glass formation and to compare it with the dielectrically determined primarily intermolecular dynamics. Molecular systems to be studied are typical glassformers as glycerol, propyleneglycol, poly-propyleneglycol, propylenecarbonate and polypropylencarbonate. By that a wealth of novel information is obtained proving that the different molecular moieties of a glass former show often strongly different characteristic, temperature dependencies. This demonstrates the fundamental importance of intra-molecular dynamics giving refined insights into the underlying interactions beyond coarse-grained models treating the glassformer as rigid body.