Volume 36, Number 4, November I 1996
|Page(s)||277 - 282|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Inelastic neutron and Raman scattering of poly(methyl methacrylate): Nanostructure of polymer glasses
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
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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