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Conductivity and time-temperature correspondence in polar viscoelastic liquids

AuthorsCarsí, M.; Sanchis, M. J.; Ortiz-Serna, P.; Redondo-Foj, B.; Díaz-Calleja, R.; Riande, Evaristo
Issue Date2013
PublisherAmerican Chemical Society
CitationMacromolecules 46: 3167-3175 (2013)
AbstractThis work is focused on the conductivity study of viscoelastic liquids, taking as a model poly(2,3-dimethoxybenzyl methacrylate). Each isotherm, displaying the conductivity in the frequency domain, shows a plateau in the low frequency region, representing the dc conductivity. The covered frequency range by the plateau increases with the temperature. The frequency corresponding to the end of the plateau, ωc, marks the onset of the ac conductivity, which correspond in increasing order of frequency to Maxwell-Wagner-Sillars, glass-rubber transition and secondary relaxations. The contributions of the relaxation processes to the ac conductivity in the wholly frequencies range were analyzed. The time-temperature correspondence principle holds for the reduced ac conductivity. However, this principle does not hold for the components of the complex dielectric permittivity due, among other things, to the different temperature dependences of each dipolar relaxation processes. Analogueies and differences between the conductivity behavior of viscoelastic liquids and disordered inorganic solids are discussed.
Identifiersdoi: 10.1021/ma400224x
issn: 0024-9297
e-issn: 1520-5835
Appears in Collections:(ICTP) Artículos
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