Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects

The volume changes of poly(2-methylaniline) upon redox cycling in different acidic media was studied using voltammetric experiments with simultaneous microscopic observation. These experiments were performed during continuous potential cycling and also when the polymer film was completely reduced an...

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Autores principales:	Andrade, Estela María, Molina, Fernando Victor
Publicado:	2000
Materias:	Chemical relaxation Electrolytes Negative ions Redox reactions Volume measurement Polymethylaniline Redox switching Conductive plastics
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10990062_v3_n11_p504_Andrade http://hdl.handle.net/20.500.12110/paper_10990062_v3_n11_p504_Andrade
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_10990062_v3_n11_p504_Andrade
record_format	dspace
spelling	paper:paper_10990062_v3_n11_p504_Andrade2023-06-08T16:08:01Z Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects Andrade, Estela María Molina, Fernando Victor Chemical relaxation Electrolytes Negative ions Redox reactions Volume measurement Polymethylaniline Redox switching Conductive plastics The volume changes of poly(2-methylaniline) upon redox cycling in different acidic media was studied using voltammetric experiments with simultaneous microscopic observation. These experiments were performed during continuous potential cycling and also when the polymer film was completely reduced and relaxed. The changes in the area occupied by the polymer film in the microscope images was taken as a measure of volume variations. During continuous potential cycling the films showed smooth, relatively low changes, showing hysteresis and dependence on the electrolyte anion. When the polymer was completely reduced and relaxed, its volume reached a minimum. The dimensional changes had a steep increase in the subsequent anodic scan, the overall change being about an order of magnitude higher than in continuous cycling, with little dependence on the electrolyte anion. During the cathodic scan the volume changes were similar to the stationary cycling experiments. These results suggest that the volume changes are due to two different processes, the faster one being proton and anion exchange with the electrolyte, both carrying solvent molecules. The other process is a structural change of the polymer backbone, giving higher volume changes but having, during the reduction step, a much lower rate. Fil:Andrade, E.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10990062_v3_n11_p504_Andrade http://hdl.handle.net/20.500.12110/paper_10990062_v3_n11_p504_Andrade
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Chemical relaxation Electrolytes Negative ions Redox reactions Volume measurement Polymethylaniline Redox switching Conductive plastics
spellingShingle	Chemical relaxation Electrolytes Negative ions Redox reactions Volume measurement Polymethylaniline Redox switching Conductive plastics Andrade, Estela María Molina, Fernando Victor Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
topic_facet	Chemical relaxation Electrolytes Negative ions Redox reactions Volume measurement Polymethylaniline Redox switching Conductive plastics
description	The volume changes of poly(2-methylaniline) upon redox cycling in different acidic media was studied using voltammetric experiments with simultaneous microscopic observation. These experiments were performed during continuous potential cycling and also when the polymer film was completely reduced and relaxed. The changes in the area occupied by the polymer film in the microscope images was taken as a measure of volume variations. During continuous potential cycling the films showed smooth, relatively low changes, showing hysteresis and dependence on the electrolyte anion. When the polymer was completely reduced and relaxed, its volume reached a minimum. The dimensional changes had a steep increase in the subsequent anodic scan, the overall change being about an order of magnitude higher than in continuous cycling, with little dependence on the electrolyte anion. During the cathodic scan the volume changes were similar to the stationary cycling experiments. These results suggest that the volume changes are due to two different processes, the faster one being proton and anion exchange with the electrolyte, both carrying solvent molecules. The other process is a structural change of the polymer backbone, giving higher volume changes but having, during the reduction step, a much lower rate.
author	Andrade, Estela María Molina, Fernando Victor
author_facet	Andrade, Estela María Molina, Fernando Victor
author_sort	Andrade, Estela María
title	Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
title_short	Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
title_full	Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
title_fullStr	Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
title_full_unstemmed	Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
title_sort	volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects
publishDate	2000
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10990062_v3_n11_p504_Andrade http://hdl.handle.net/20.500.12110/paper_10990062_v3_n11_p504_Andrade
work_keys_str_mv	AT andradeestelamaria volumechangesofpoly2methylanilineuponredoxswitchinganionandrelaxationeffects AT molinafernandovictor volumechangesofpoly2methylanilineuponredoxswitchinganionandrelaxationeffects
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Volume changes of poly(2-methylaniline) upon redox switching anion and relaxation effects

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