Low-temperature dynamics in amorphous polymers and low-molecular-weight glasses-what is the difference?

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00004783
URN to cite this document: urn:nbn:de:bvb:703-epub-4783-9

Title data

Eremchev, Ivan Yu. ; Vainer, Yury 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 1463-9076
DOI der Verlagsversion: https://doi.org/10.1039/c0cp01690j

Format: PDF Name: c0cp01690j.pdf Version: Published Version Available under License German copyright law. This contribution is freely accessible with the consent of the copyright holder on the basis of an (DFG-funded) alliance or national license. The document may be used free of charge for personal use. In addition, the reproduction, editing, distribution and any kind of exploitation require the written consent of the respective rights holder.

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Project financing:	Deutsche Forschungsgemeinschaft

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.

Further data

Item Type:	Article in a journal
Additional notes (visible to public):	ISI:000286388800015
DDC Subjects:	500 Science > 530 Physics 500 Science > 540 Chemistry
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter Research Institutions > Central research institutes > Bayreuth Institute of Macromolecular Research - BIMF Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Research Institutions Research Institutions > Central research institutes
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-4783-9
Date Deposited:	08 Sep 2020 06:51
Last Modified:	08 Sep 2020 06:51
URI:	https://epub.uni-bayreuth.de/id/eprint/4783

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