Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures

The low temperature thermal behavior of Nafion 117 membranes with different water contents and equilibrated with water-methanol mixtures of different concentrations were studied by differential scanning calorimetry (DSC). The DSC curves revealed a weak transition at temperatures below -100 °C, relat...

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Autores principales: Corti, Horacio Roberto, Buera, María del Pilar
Publicado: 2006
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03787753_v161_n2_p799_Corti
http://hdl.handle.net/20.500.12110/paper_03787753_v161_n2_p799_Corti
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spelling paper:paper_03787753_v161_n2_p799_Corti2023-06-08T15:40:28Z Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures Corti, Horacio Roberto Buera, María del Pilar DMPEM fuel cells Freezing Glass transition temperature Methanol Nafion Water Atmospheric humidity Differential scanning calorimetry Freezing Fuel cells Glass transition Low temperature effects Methanol Thermodynamic properties Water Ice fusion Mechanical dynamics Nafion Polymeric membranes The low temperature thermal behavior of Nafion 117 membranes with different water contents and equilibrated with water-methanol mixtures of different concentrations were studied by differential scanning calorimetry (DSC). The DSC curves revealed a weak transition at temperatures below -100 °C, related to the γ peak reported in mechanical dynamics studies, and associated to the true glass transition temperature of the polymer. The amount of freezable water was determined from the area of the ice fusion peak and it increased from 1 to 23% as the relative humidity increases from 84 to 100%. The presence of methanol in the membrane increased the amount of freezable water up to 65%. © 2006 Elsevier B.V. All rights reserved. Fil:Corti, H.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pilar Buera, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03787753_v161_n2_p799_Corti http://hdl.handle.net/20.500.12110/paper_03787753_v161_n2_p799_Corti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic DMPEM fuel cells
Freezing
Glass transition temperature
Methanol
Nafion
Water
Atmospheric humidity
Differential scanning calorimetry
Freezing
Fuel cells
Glass transition
Low temperature effects
Methanol
Thermodynamic properties
Water
Ice fusion
Mechanical dynamics
Nafion
Polymeric membranes
spellingShingle DMPEM fuel cells
Freezing
Glass transition temperature
Methanol
Nafion
Water
Atmospheric humidity
Differential scanning calorimetry
Freezing
Fuel cells
Glass transition
Low temperature effects
Methanol
Thermodynamic properties
Water
Ice fusion
Mechanical dynamics
Nafion
Polymeric membranes
Corti, Horacio Roberto
Buera, María del Pilar
Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
topic_facet DMPEM fuel cells
Freezing
Glass transition temperature
Methanol
Nafion
Water
Atmospheric humidity
Differential scanning calorimetry
Freezing
Fuel cells
Glass transition
Low temperature effects
Methanol
Thermodynamic properties
Water
Ice fusion
Mechanical dynamics
Nafion
Polymeric membranes
description The low temperature thermal behavior of Nafion 117 membranes with different water contents and equilibrated with water-methanol mixtures of different concentrations were studied by differential scanning calorimetry (DSC). The DSC curves revealed a weak transition at temperatures below -100 °C, related to the γ peak reported in mechanical dynamics studies, and associated to the true glass transition temperature of the polymer. The amount of freezable water was determined from the area of the ice fusion peak and it increased from 1 to 23% as the relative humidity increases from 84 to 100%. The presence of methanol in the membrane increased the amount of freezable water up to 65%. © 2006 Elsevier B.V. All rights reserved.
author Corti, Horacio Roberto
Buera, María del Pilar
author_facet Corti, Horacio Roberto
Buera, María del Pilar
author_sort Corti, Horacio Roberto
title Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
title_short Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
title_full Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
title_fullStr Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
title_full_unstemmed Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
title_sort low temperature thermal properties of nafion 117 membranes in water and methanol-water mixtures
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03787753_v161_n2_p799_Corti
http://hdl.handle.net/20.500.12110/paper_03787753_v161_n2_p799_Corti
work_keys_str_mv AT cortihoracioroberto lowtemperaturethermalpropertiesofnafion117membranesinwaterandmethanolwatermixtures
AT bueramariadelpilar lowtemperaturethermalpropertiesofnafion117membranesinwaterandmethanolwatermixtures
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