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Low-Temperature Dynamics in Amorphous Polymers and Low-Molecular-Weight Glasses - what is the Difference?

Titelangaben

Eremchev, I. Yu. ; Vainer, Yuri G. ; Naumov, Andrei V. ; Kador, Lothar:
Low-Temperature Dynamics in Amorphous Polymers and Low-Molecular-Weight Glasses - what is the Difference?
In: Physical Chemistry Chemical Physics. Bd. 13 (2011) Heft 5 . - S. 1843-1848.
ISSN 1463-9084
DOI: https://doi.org/10.1039/C0CP01690J

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Abstract

Numerous experiments have shown that the low-temperature dynamics of a wide variety of disordered solids is qualitatively universal. However, most of these results were obtained with ensemble-averaging techniques which hide the local parameters of the dynamic processes. We used single-molecule (SM) spectroscopy for direct observation of the dynamic processes in disordered solids with different internal structure and chemical composition. The surprising result is that the dynamics of low-molecular-weight glasses and short-chain polymers does not follow, on a microscopic level, the current concept of low-temperature glass dynamics. An extra contribution to the dynamics was detected causing irreproducible jumps and drifts of the SM spectra on timescales between milliseconds and minutes. In most matrices consisting of small molecules and oligomers, the spectral dynamics was so fast that SM spectra could hardly or not at all be recorded and only irregular fluorescence flares were observed. These results provide new mechanistic insight into the behavior of glasses in general: At low temperatures, the local dynamics of disordered solids is not universal but depends on the structure and chemical composition of the material.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Forschungseinrichtungen > Forschungszentren > Bayreuther Institut für Makromolekülforschung - BIMF
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 27 Mär 2015 07:27
Letzte Änderung: 27 Jan 2022 12:20
URI: https://eref.uni-bayreuth.de/id/eprint/8647