Volume 63, Number 5, September 2003
|Page(s)||778 - 784|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Effect of physical aging on the low-frequency vibrational density of states of a glassy polymer
Laboratoire de Physicochimie des Matériaux Luminescents Université Lyon I, UMR CNRS 5620 - 43 Boulevard du 11 Novembre 1918 69622 Villeurbanne Cedex, France
2 Laboratoire de Recherche sur la Réactivité des Solides, Université de Bourgogne and CNRS - BP 47870, 21078 Dijon Cedex, France
3 Laboratoire des Matériaux Polymères et Biomatériaux Université Lyon I, UMR CNRS - 43 Boulevard du 11 Novembre 1918 69622 Villeurbanne Cedex, France
4 Laboratoire de Physique des Matériaux, UMR CNRS 7556 Ecole des Mines - 54042 Nancy Cedex, France
5 Laboratoire de Physique de la Matière Condensée et Nanostrutures Université Lyon I, UMR CNRS 5586 - 43 Boulevard du 11 Novembre 1918 69622 Villeurbanne Cedex, France
Accepted: 18 June 2003
The effects of the physical aging on the vibrational density of states (VDOS) of a polymeric glass is studied. The VDOS of a poly(methyl methacrylate) glass at low energy (), was determined from inelastic neutron scattering at low temperature for two different physical thermodynamical states. One sample was annealed during a long time at temperature lower than , and another was quenched from a temperature higher than . It was found that the VDOS around the boson peak, relatively to the one at higher energy, decreases with annealing at lower temperature than , i.e., with the physical aging.
PACS: 78.30.Ly – Disordered solids / 63.50.+x – Vibrational states in disordered systems / 64.70.Pf – Glass transitions
© EDP Sciences, 2003
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