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Dresden 2014 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 32: Glasses and Glass Transition - Part I (joint session CPP/ DY/DF)

DY 32.3: Vortrag

Donnerstag, 3. April 2014, 12:30–12:45, ZEU 114

Glassy dynamics and physical aging in fucose saccharides as studied by Infrared- and Broadband Dielectric Spectroscopy — •Wilhelm Kossack1, Karolina Adrjanowicz2, Magdalena Tarnacka1, Wycliffe Kiprop Kipnusu1, Mateusz Dulski2, Emanuel Urandu Mapesa1, Kamil Kaminski2, Sebastian Pawlus2, Marian Paluch2, and Friedrich Kremer11Universität Leipzig, Linnestr.5, Molekülphysik, 04103 Leipzig, Germany — 2Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland

Fourier Transform InfraRed (FTIR) and Broadband Dielectric Spectroscopy (BDS) are combined to study both, the intra- and inter-molecular dynamics for two isomers of glass forming fucose, far below and above the calorimetric glass transition temperature, Tg. It is shown, that the various IR-active vibrations exhibit in their spectral position and oscillator strength quite different temperature dependencies, proving their specific signature in the course of densification and glass formation. The coupling between intra- and inter-molecular dynamics is exemplified by distinct changes of IR active ring vibrations far above the calorimetric glass transition temperature at about 1.16 Tg, where the dynamic glass transition (α relaxation) and the secondary β relaxation merge. — For samples physically annealed below TG slower isothermal relaxation times than extrapolated from liquid state are observed .

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