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  Correlation between nonexponential relaxation and non-Arrhenius behavior under conditions of high compression

Gapinski, J., Paluch, M., & Patkowski, A. (2002). Correlation between nonexponential relaxation and non-Arrhenius behavior under conditions of high compression. Physical Review E, 66(1): 011501.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-65AC-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-65AD-B
Genre: Journal Article

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

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 Abstract: Photon correlation spectroscopy was used to investigate the behavior of the dynamical properties of 1,1'-di(4-methoxy-5- methyl-phenyl)cyclohexane (BMMPC) at elevated pressures. The fragility of BMMPC measured by the steepness index m(T) is decreasing and the nonexponentiality parameter beta(KWW) is increasing with increasing pressure. This result strongly suggests that the phenomenological correlation between the steepness index and nonexponentionality is also preserved under high compression. The pressure dependence of the structural relaxation times is well characterized by a simple activation volume form. The activation volume continuously increases with decreasing temperature, which is probably due to the increase of cooperativity of the structural relaxation process. Moreover, we found that the glass-transition temperature exhibits a significant dependence on pressure.

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Language(s): eng - English
 Dates: 2002-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28656
ISI: 000177200500033
Other: P-02-172
 Degree: -

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Title: Physical Review E
  Alternative Title : Phys. Rev. E
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 66 (1) Sequence Number: 011501 Start / End Page: - Identifier: ISSN: 1063-651X