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Rate memory of structural relaxation in glasses and its detection by multidimensional NMR

MPS-Authors
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Heuer,  Andreas
Research Group Prof. Dr. Haeberlen, Max Planck Institute for Medical Research, Max Planck Society;

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Zimmermann,  Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Spiess,  Hans W.
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

External Resource

http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.75.2851
(Any fulltext)

http://dx.doi.org/10.1103/PhysRevLett.75.2851
(Any fulltext)

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Citation

Heuer, A., Wilhelm, M., Zimmermann, H., & Spiess, H. W. (1995). Rate memory of structural relaxation in glasses and its detection by multidimensional NMR. Physical Review Letters, 75(15), 2851-2854. doi:10.1103/PhysRevLett.75.2851.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-45CD-5
Abstract
A new aspect of the nature of the relaxation rate distribution of α relaxation in glasses is analyzed for the example of a polymer: How long does a polymer segment remember its relaxation rate? For a two-state system we describe the rate memory in terms of a single dimensionless parameter. Applying the theory to multidimensional NMR exchange experiments, the rate memory of a polymer slightly above its glass transition temperature is determined. The rate memory is near its theoretical minimum, indicating strong coupling of the individual relaxation modes.