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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 42958.0, MPI für Polymerforschung / MPI Polymerforschung
Temperature and pressure study of Brillouin transverse modes in the organic glass-forming liquid orthoterphenyl
Authors:Dreyfus, C.; Aouadi, A.; Gapinski, J.; Matos-Lopes, M.; Steffen, W.; Patkowski, A.; Pick, R. M.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physical Review E
Journal Abbrev.:Phys. Rev. E
Issue / Number:1
Sequence Number of Article:011204
Review Status:not specified
Audience:Not Specified
Abstract / Description:Transverse Brillouin spectra of orthoterphenyl are measured in the (250-305 K; 0.1-100 MPa) temperature-pressure range, which corresponds to the supercooled phase of this organic glass former. We show that the analysis of these spectra combined with an extrapolation of the reorientation times under pressure leads to an estimate of the static shear viscosity in a pressure range whose validity extends beyond the range of the Brillouin measurements. The relative contributions of temperature and of density to the change of this reorientation time measured along an isobar are extracted from our results in a large temperature range extending from the liquid to the low temperature supercooled state. They appear to be always of the same order of magnitude. It is also shown that in the range of the experiment, the orientational time is depending on a unique parameter built on temperature and density.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Paris 06, PMC, Case Postale 86,4 Pl Jussieu, F-75005 Paris, France; Univ Paris 06, UFR 25, F-75005 Paris, France; Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland; Univ Lisbon, Dept Quim & Bioquim, P-1749016 Lisbon, Portugal
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