| Issue |
Europhys. Lett.
Volume 40, Number 2, October II 1997
|
|
|---|---|---|
| Page(s) | 165 - 170 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00440-4 | |
| Published online | 01 September 2002 | |
Fast relaxation in amorphous polymers: Relation to free volume
1
Universität Bayreuth, Physikalisches Institut,
95440 Bayreuth, Germany
2
Laboratoire de Physico-Chimie des Matériaux Luminescents,
Université Lyon I, URA No 442 du CNRS,
43 boulevard du 11 Novembre 1918, Bât. 205,
69622 Villeurbanne Cedex, France
Received:
14
October
1996
Accepted:
12
September
1997
A model of the fast relaxation process in amorphous polymers is presented based on the damping of the boson peak vibrations by the free-volume fluctuations. Comparison of the fast relaxation in polycarbonate as is seen in the low-frequency Raman spectra with the positron annihilation lifetime spectroscopy data for the fractional free volume in a broad temperature interval 50–450 K shows an apparent correlation between the relaxation strength and the free volume, in good agreement with the predictions of the model.
PACS: 64.70.Pf – Glass transitions / 63.20.Pw – Localized modes
© EDP Sciences, 1997
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