Effect of physical aging on the low-frequency vibrational density of states of a glassy polymer

E. Duval; L. Saviot; L. David; S. Etienne; J. F. Jal

doi:10.1209/epl/i2003-00573-x

All issues

Volume 63 / No 5 (September 2003)

Europhys. Lett., 63 5 (2003) 778-784

Abstract

Issue		Europhys. Lett. Volume 63, Number 5, September 2003


Page(s)		778 - 784
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00573-x
Published online		01 November 2003

Europhys. Lett., 63 (5), pp. 778-784 (2003)

Effect of physical aging on the low-frequency vibrational density of states of a glassy polymer

E. Duval¹, L. Saviot², L. David³, S. Etienne⁴ and J. F. Jal⁵

¹ 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

Received: 8 May 2003
Accepted: 18 June 2003

Abstract

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 ( $<15$ $\un{meV}$ ), 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 $T_{\ab{g}}$ , and another was quenched from a temperature higher than $T_{\ab{g}}$ . It was found that the VDOS around the boson peak, relatively to the one at higher energy, decreases with annealing at lower temperature than $T_{\ab{g}}$ , 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

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