| Issue |
Europhys. Lett.
Volume 68, Number 1, October 2004
|
|
|---|---|---|
| Page(s) | 58 - 64 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10214-6 | |
| Published online | 01 September 2004 | |
Scaling out the density dependence of the α relaxation in glass-forming polymers
1
Laboratoire de Chimie Physique, Bâtiment 349 Université de Paris Sud, F-91405 Orsay, France
2
Departamento de Física de Materiales (UPV/EHU) and Unidad de Física de Materiales (CSIC-UPV/EHU) Apartado 1072, E-20080 San Sebastián, Spain
3
Laboratoire de Physique Théorique des Liquides Université Pierre et Marie Curie 4 Place Jussieu, F-75252 Paris Cedex 05, France
Received:
15
March
2004
Accepted:
6
August
2004
We show that the density and temperature dependences of the
α-relaxation time of several glass-forming polymers can be
described through a single scaling variable 
, where
is well fitted by a power law 
, x being a
species-specific parameter. This implies that “fragility” is an
intrinsic, density-independent property of a glass-former
characterizing its super-Arrhenius slowing-down of relaxations,
and it leads us to propose a modification of the celebrated
Angell plot.
PACS: 64.70.Pf – Glass transitions / 61.20.Lc – Time-dependent properties; relaxation / 61.41.+e – Polymers, elastomers, and plastics
© EDP Sciences, 2004
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