Secondary relaxation in confined and bulk propylene carbonate

Dielectric loss spectra of propylene carbonate in bulk and dissolved in a polymer matrix are investigated with focus on the currently debated excess wing. The spatial restrictions caused by the polymer matrix slow down the main structural (α) relaxation, while the excess wing continuously transforms...

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Bibliographic Details
Published in:Europhysics letters 2003-11, Vol.64 (3), p.358-363
Main Authors: Svanberg, C, Bergman, R, Jacobsson, P
Format: Article
Language:English
Subjects:
64.70.Pf
77.22.Gm
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Dielectric loss and relaxation
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Glass transitions
Physics
Specific phase transitions
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Summary:Dielectric loss spectra of propylene carbonate in bulk and dissolved in a polymer matrix are investigated with focus on the currently debated excess wing. The spatial restrictions caused by the polymer matrix slow down the main structural (α) relaxation, while the excess wing continuously transforms towards a shoulder with increasing spatial restrictions. We show that the excess wing in a consistent manner can be described by a secondary relaxation with only a weak dependence of the concentration of polymer. Thus the results imply that the excess wing is due to a secondary relaxation submerged in the α-relaxation.
ISSN:0295-5075
1286-4854
1286-4854
DOI:10.1209/epl/i2003-00202-4