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  Dielectric and mechanical relaxation of cresolphthalein- dimethylether

Paluch, M., Roland, C. M., & Best, A. (2002). Dielectric and mechanical relaxation of cresolphthalein- dimethylether. Journal of Chemical Physics, 117(3), 1188-1193.

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 Creators:
Paluch, M.1, Author           
Roland, C. M., Author
Best, A.1, Author           
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Abstract: From pressure-volume-temperature measurements, in combination with published dielectric spectroscopy results, we assess the volume dependence of structural relaxation in cresolphthalein- dimethylether (KDE). Structural relaxation in KDE cannot be described as either a volume activated or thermally activated process, and unlike results for some other molecular glass formers, temperature is not the dominant control variable. The inflection point of the PVT data yields a glass temperature, T- g, that corresponds to a dielectric relaxation time equal to 10 s. There is a marked variation with pressure, dT(g)/dP=307 K/GPa at low pressure. We also carried out dynamic mechanical measurements on KDE near T-g. The shape of the mechanical and dielectric relaxation functions, as well as both the magnitude and temperature dependence of the respective relaxation times, are the same. Such equivalence is not generally expected, and arises herein due to the rigid structure of the KDE molecule. (C) 2002 American Institute of Physics.

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Language(s): eng - English
 Dates: 2002-07-15
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28689
ISI: 000176600500026
Other: P-02-174
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Title: Journal of Chemical Physics
  Alternative Title : J. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 117 (3) Sequence Number: - Start / End Page: 1188 - 1193 Identifier: ISSN: 0021-9606