Volume 38, Number 7, June I 1997
|Page(s)||515 - 520|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Localized fast relaxation in poly(methyl methacrylate) glass
LPCML,UMR-CNRS 5620, Université Lyon 1 - 69622 Villeurbanne, France
2 DPM, UMR-CNRS 5586, Université Lyon 1 - 69622 Villeurbanne, France
3 Institut Laue-Langevin - F38042 Grenoble Cedex, France
4 Department of Materials Science, University of Michigan, 2300 Hayward Street, Ann Arbor, Michigan 48109, USA
Accepted: 21 April 1997
Fast relaxational motions in glassy PMMA were investigated through quasielastic neutron scattering. As previously found with quasielastic light scattering, the corresponding relaxation time, which is of the order of 10-11 s, is only slightly temperature dependent, while the relaxational signal intensity increases rapidly with temperature. To elucidate the origin of this behavior, comparison is made between the non-linearly temperature-dependent part of the mean-square displacement and the hole volume fraction, as determined by positron annihilation lifetime spectroscopy. These two quantities appear to be strongly correlated. A model, which takes into account the presence of holes in the glassy matrix, is proposed to explain the Debye-Waller factor behavior.
PACS: 61.43.-j – Disordered solids / 61.12.-q – Neutron diffraction and scattering / 61.41.+e – Polymers, elastomers, and plastics
© EDP Sciences, 1997
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