Volume 68, Number 1, October 2004
|Page(s)||58 - 64|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2004|
Scaling out the density dependence of the α relaxation in glass-forming polymers
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
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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