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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28593.0, MPI für Polymerforschung / MPI Polymerforschung
Volume effects on the molecular mobility close to glass transition in supercooled phenylphthalein-dimethylether. II
Authors:Paluch, M.; Casalini, R.; Best, A.; Patkowski, A.
Date of Publication (YYYY-MM-DD):2002-10-22
Title of Journal:Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Issue / Number:16
Start Page:7624
End Page:7630
Review Status:No review
Audience:Not Specified
Abstract / Description:Pressure-volume-temperature measurements in phenylphthalein- dimethylether (PDE) are reported, in combination with recently published dynamic light scattering data obtained under high pressure. We discuss the role that volume and thermal effects play in controlling the dynamics in the vicinity of the glass transition. Although volume is not the unique thermodynamical parameter characterizing the relaxation dynamics in PDE, its contribution to the super-Arrhenius behavior of the relaxation times in the vicinity of the glass transition is remarkable. The contribution of volume to the temperature dependence of the relaxation times has been characterized by means of the ratio of the activation energy at constant volume to the enthalpy of activation at constant pressure, E-V/H-P. We point out that this quantity is correlated with the temperature behavior of the nonexponentiallity parameter, beta(KWW). Moreover, the tau(T,P) values were analyzed in terms of an extension of the Adam-Gibbs model. It was shown that this model gives a satisfactory interpretation of the pressure sensitivity of the dynamics (d log(10)(tau)/dP)\(T) in terms of thermodynamic properties of the material. (C) 2002 American Institute of Physics.
Comment of the Author/Creator:Date: 2002, OCT 22
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Silesian Univ, Inst Phys, Uniwersytecka 4, PL-40007 Katowice, Poland; USN, Res Lab, Div Chem, Washington, DC 20375 USA; Univ Pisa, INFM, I-56127 Pisa, Italy; Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland
Identifiers:ISI:000178483400023 [ID No:1]
ISSN:0021-9606 [ID No:2]
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