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

Title data

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. Vol. 13 (2011) Issue 5 . - pp. 1843-1848.
ISSN 1463-9084
DOI: https://doi.org/10.1039/C0CP01690J

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 500 Natural sciences
500 Science > 530 Physics
Date Deposited: 27 Mar 2015 07:27
Last Modified: 16 Apr 2015 13:52
URI: https://eref.uni-bayreuth.de/id/eprint/8647