Issue |
Europhys. Lett.
Volume 36, Number 4, November I 1996
|
|
---|---|---|
Page(s) | 277 - 282 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00222-0 | |
Published online | 01 September 2002 |
Inelastic neutron and Raman scattering of poly(methyl methacrylate): Nanostructure of polymer glasses
1
Laboratoire de Physico-Chimie des Matériaux Luminescents,
UMR-CNRS 5620, Université Lyon I, 69622 Villeurbanne, France
2
Département de Physique des Matériaux,
UMR-CNRS 5586, Université Lyon I, 69622
Villeurbanne, France
3
Institut Laue-Langevin, F-38042 Grenoble Cedex, France
Received:
29
July
1996
Accepted:
19
September
1996
Low-energy excitations were investigated in amorphous poly(methyl methacrylate) by means of both neutron and Raman scatterings, in a wide temperature interval. The frequency dependence of the light-vibration coupling coefficient was deduced, especially at low temperature where the quasi-elastic contribution is not significant; it was not found to be linear. The vibrational density-of-states anomaly is interpreted in the frame of a non-continuous glassy nanostructure, which is characterized by a log-normal size distribution of domains.
PACS: 63.50.+x – Vibrational states in disordered systems / 78.30.Ly – Disordered solids
© EDP Sciences, 1996
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