Effect of pressure on the α relaxation in glycerol and xylitol

The effect of pressure on the dielectric relaxation of two polyhydroxy alcohols is examined by analysis of existing data on glycerol, together with new measurements on xylitol. The fragility, or Tg-normalized temperature dependence, changes with pressure for low pressures, but becomes invariant abov...

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Bibliographic Details
Published in:The Journal of chemical physics 2002-06, Vol.116 (22), p.9839-9844
Main Authors: Paluch, M., Casalini, R., Hensel-Bielowka, S., Roland, C. M.
Format: Article
Language:English
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Summary:The effect of pressure on the dielectric relaxation of two polyhydroxy alcohols is examined by analysis of existing data on glycerol, together with new measurements on xylitol. The fragility, or Tg-normalized temperature dependence, changes with pressure for low pressures, but becomes invariant above 1 GPa. When compared at temperatures for which the α-relaxation times are equal, there is no effect of pressure (
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1473652