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Abstract:

The temperature dependence of the relaxation of poly(aniline) (Pani) and poly (o-toluidine) (POT) in aqueous eutectics of H2SO4 and HClO4, in the temperature range 200 K < T < 300 K, was investigated. As the temperature decreased the anodic peak parameters, E p,a increased, ΔE1/2,a increased, and jp, decreased. The data is interpreted qualitatively within the framework of the extended Feldberg's model, which takes into account the capacitive current contribution to the total current as well as the interaction between neighboring redox centers. The results agree with other experimental observations related to the relaxation of the polymer films. The temperature dependence of the change in the anodic peak parameters shows that the polymer relaxation decreases as the temperature is decreased. The relaxation can be explained through a kinetic process with a rate constant depending on the degree of advance of the reaction (Elovich kinetics). © 2005 The Electrochemical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Temperature effects on the relaxation of poly(aniline) and poly(o-toluidine)
Autor:Andrade, E.M.; Molina, F.V.; Posadas, D.; Florit, M.I.
Filiación:Depto. de Quim. Inorgánica, INQUIMAE, Ciudad Univtrsitaria, 1428 Buenos Aires, Argentina
Inst. Invest. Fisicoquim. Teor./Apl., Universidad National de La Plata, 1900 La Plata, Argentina
Palabras clave:Chemical relaxation; Current density; Diffusion; Free energy; Mathematical models; Oxidation; Reaction kinetics; Reduction; Sulfuric acid; Thermal effects; Anodic peak; Poly(aniline) (PANI); Poly(o-toluidine) (POT); Temperature dependence; Organic polymers
Año:2005
Volumen:152
Número:3
Página de inicio:E75
Página de fin:E83
DOI: http://dx.doi.org/10.1149/1.1854091
Título revista:Journal of the Electrochemical Society
Título revista abreviado:J Electrochem Soc
ISSN:00134651
CODEN:JESOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v152_n3_pE75_Andrade

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Citas:

---------- APA ----------
Andrade, E.M., Molina, F.V., Posadas, D. & Florit, M.I. (2005) . Temperature effects on the relaxation of poly(aniline) and poly(o-toluidine). Journal of the Electrochemical Society, 152(3), E75-E83.
http://dx.doi.org/10.1149/1.1854091
---------- CHICAGO ----------
Andrade, E.M., Molina, F.V., Posadas, D., Florit, M.I. "Temperature effects on the relaxation of poly(aniline) and poly(o-toluidine)" . Journal of the Electrochemical Society 152, no. 3 (2005) : E75-E83.
http://dx.doi.org/10.1149/1.1854091
---------- MLA ----------
Andrade, E.M., Molina, F.V., Posadas, D., Florit, M.I. "Temperature effects on the relaxation of poly(aniline) and poly(o-toluidine)" . Journal of the Electrochemical Society, vol. 152, no. 3, 2005, pp. E75-E83.
http://dx.doi.org/10.1149/1.1854091
---------- VANCOUVER ----------
Andrade, E.M., Molina, F.V., Posadas, D., Florit, M.I. Temperature effects on the relaxation of poly(aniline) and poly(o-toluidine). J Electrochem Soc. 2005;152(3):E75-E83.
http://dx.doi.org/10.1149/1.1854091