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Abstract:

The sulfonation of polyaniline (PANI) films by nucleophilic addition of sulfite ion has been controlled through the polymer oxidation state under electrochemical control. The process was monitored by in situ electrochemical quartz crystal microbalance (EQCM), and the polymer oxidation was accomplished by electrode potential steps in sulfite aqueous solutions. The nucleophilic addition of sulfite to PANI only takes place on the oxidized polymer. From the ratio of added mass to the injected charge, the degree of sulfonation has been obtained with a yield as high as 50%. It has been observed that the ion-exchange mechanism during the oxidation-reduction process in the resulting sulfonated polymer is analogous to the polymer produced by electrophilic sulfonation of polyaniline or by copolymerization of aniline with aminosulfonic acids, unlike the ionic exchange observed for unmodified PANI.

Registro:

Documento: Artículo
Título:Microgravimetric Study of Electrochemically Controlled Nucleophilic Addition of Sulfite to Polyaniline
Autor:Grumelli, D.E.; Forzani, E.S.; Morales, G.M.; Miras, M.C.; Barbero, C.A.; Calvo, E.J.
Filiación:INQUIMAE, Depto. de Quím. Inorg., Ciudad Universitaria, AR-1428 Buenos Aires, Argentina
Departamento de Química, Univ. Nacional de Río Cuarto, Agencia Postal No. 3, 5800 - Río Cuarto, Argentina
Department of Chemistry, University of Chicago, 5640 South Ellis Ave., Chicago, IL 60637, United States
Palabras clave:Nucleophilic addition; Quartz crystal microbalances (QCM); Aromatic compounds; Electric conductivity; Electrochemistry; Electrodes; Gravimetric analysis; Ion exchange; Oxidation; Reduction; Solubility; Solutions; Sulfonation; Aromatic Compounds; Electrochemistry; Gravimetry; Ion Exchange; Oxidation; Sulfonation
Año:2004
Volumen:20
Número:6
Página de inicio:2349
Página de fin:2355
DOI: http://dx.doi.org/10.1021/la0354990
Título revista:Langmuir
Título revista abreviado:Langmuir
ISSN:07437463
CODEN:LANGD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v20_n6_p2349_Grumelli

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Citas:

---------- APA ----------
Grumelli, D.E., Forzani, E.S., Morales, G.M., Miras, M.C., Barbero, C.A. & Calvo, E.J. (2004) . Microgravimetric Study of Electrochemically Controlled Nucleophilic Addition of Sulfite to Polyaniline. Langmuir, 20(6), 2349-2355.
http://dx.doi.org/10.1021/la0354990
---------- CHICAGO ----------
Grumelli, D.E., Forzani, E.S., Morales, G.M., Miras, M.C., Barbero, C.A., Calvo, E.J. "Microgravimetric Study of Electrochemically Controlled Nucleophilic Addition of Sulfite to Polyaniline" . Langmuir 20, no. 6 (2004) : 2349-2355.
http://dx.doi.org/10.1021/la0354990
---------- MLA ----------
Grumelli, D.E., Forzani, E.S., Morales, G.M., Miras, M.C., Barbero, C.A., Calvo, E.J. "Microgravimetric Study of Electrochemically Controlled Nucleophilic Addition of Sulfite to Polyaniline" . Langmuir, vol. 20, no. 6, 2004, pp. 2349-2355.
http://dx.doi.org/10.1021/la0354990
---------- VANCOUVER ----------
Grumelli, D.E., Forzani, E.S., Morales, G.M., Miras, M.C., Barbero, C.A., Calvo, E.J. Microgravimetric Study of Electrochemically Controlled Nucleophilic Addition of Sulfite to Polyaniline. Langmuir. 2004;20(6):2349-2355.
http://dx.doi.org/10.1021/la0354990