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  Dynamic light scattering studies of supercooled phenylphthalein-dimethylether dynamics under high pressure

Patkowski, A., Paluch, M., & Kriegs, H. (2002). Dynamic light scattering studies of supercooled phenylphthalein-dimethylether dynamics under high pressure. Journal of Chemical Physics, 117(5), 2192-2198.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-656F-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-6570-4
Genre: Journal Article

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 Creators:
Patkowski, A.1, Author              
Paluch, M.1, Author              
Kriegs, H.1, Author              
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Abstract: The behavior of the alpha-relaxation process in phenylphthalein-dimethylether (PDE) under high pressure was studied by means of dynamic light scattering-photon correlation spectroscopy (DLS-PCS). The temperature dependence of the relaxation time of the alpha-process at ambient pressure was found to resemble that obtained from dielectric relaxation (DR) measurements. On the basis of the DLS measurements one can conclude that PDE satisfies the correlation between nonexponentiality and fragility established for low-molecular weight glass forming liquids and polymers. On the other hand, dielectric relaxation studies indicate that PDE is an exception from this correlation. These differences between the DLS and DR studies do not result from the overlap of the alpha- and beta- processes in the DLS experiments but might be due to the different coupling of the probes seen in these experiments (optical anisotropy and dipole moment) to the dynamics of the entire PDE molecule. We also studied the effect of pressure on fragility and the glass transition temperature in PDE and we found that fragility is practically independent of pressure. (C) 2002 American Institute of Physics.

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Language(s): eng - English
 Dates: 2002-08-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28671
ISI: 000176874200032
Other: P-02-173
 Degree: -

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Title: Journal of Chemical Physics
  Alternative Title : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 117 (5) Sequence Number: - Start / End Page: 2192 - 2198 Identifier: ISSN: 0021-9606