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  Volume effects on the molecular mobility close to glass transition in supercooled phenylphthalein-dimethylether. II

Paluch, M., Casalini, R., Best, A., & Patkowski, A. (2002). Volume effects on the molecular mobility close to glass transition in supercooled phenylphthalein-dimethylether. II. The Journal of Chemical Physics, 117(16), 7624-7630. doi:10.1063/1.1510115.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-64CC-D Version Permalink: http://hdl.handle.net/21.11116/0000-0002-7837-A
Genre: Journal Article

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Paluch, M.1, Author              
Casalini, R., Author
Best, A.2, Author              
Patkowski, A.2, Author              
Affiliations:
1Silesian Univ, Inst Phys, PL-40007 Katowice, Poland, ou_persistent22              
2MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2002-10-22
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28593
ISI: 000178483400023
Other: P-02-169
DOI: 10.1063/1.1510115
 Degree: -

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Title: The Journal of Chemical Physics
  Other : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: - Volume / Issue: 117 (16) Sequence Number: - Start / End Page: 7624 - 7630 Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226