Waterproof-breathable films from multi-branched fluorinated cellulose esters

Cellulose ester films were prepared by esterification of cellulose with a multibranched fluorinated carboxylic acid, "BRFA" (BRanched Fluorinated Acid), at different anhydroglucose unit:BRFA molar ratios (i.e., 1:0, 10:1, 5:1, and 1:1). Morphological and optical analyses showed that cellul...

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Detalhes bibliográficos
Autores: Tedeschi, Giacomo, Guzmán-Puyol, Susana, Ceseracciu, Luca, Benítez, José J., Goldoni, Luca, Koschella, Andreas, Heinze, Thomas, Cavallo, Gabriella, Dichiarante, Valentina, Terraneo, Giancarlo, Athanassiou, Athanassia, Metrangolo, Pierangelo, Heredia-Guerrero, José A.
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/372145
Acesso em linha:http://hdl.handle.net/10261/372145
https://api.elsevier.com/content/abstract/scopus_id/85109806046
Access Level:acceso abierto
Palavra-chave:Acylation
Breathability
Cellulose
Hydrophobicity
Multibranched perfluoro-t-butoxy carboxylic acid
Transparency
Descrição
Resumo:Cellulose ester films were prepared by esterification of cellulose with a multibranched fluorinated carboxylic acid, "BRFA" (BRanched Fluorinated Acid), at different anhydroglucose unit:BRFA molar ratios (i.e., 1:0, 10:1, 5:1, and 1:1). Morphological and optical analyses showed that cellulose-BRFA materials at molar ratios 10:1 and 5:1 formed flat and transparent films, while the one at 1:1 M ratio formed rough and translucent films. Degrees of substitution (DS) of 0.06, 0.09, and 0.23 were calculated by NMR for the samples at molar ratios 10:1, 5:1, and 1:1, respectively. ATR-FTIR spectroscopy confirmed the esterification. DSC thermograms showed a single glass transition, typical of amorphous polymers, at -11 °C. The presence of BRFA groups shifted the mechanical behavior from rigid to ductile and soft with increasing DS. Wettability was similar to standard fluoropolymers such as PTFE and PVDF. Finally, breathability and water uptake were characterized and found comparable to materials typically used in textiles.

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