Waterproof-breathable films from multi-branched fluorinated cellulose esters

Giacomo Tedeschi*, Susana Guzman-Puyol, Luca Ceseracciu, José J. Benitez, Luca Goldoni, Andreas Koschella, Thomas Heinze, Gabriella Cavallo, Valentina Dichiarante, Giancarlo Terraneo, Athanassia Athanassiou, Pierangelo Metrangolo, José A. Heredia-Guerrero

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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.

Original languageEnglish
Article number118031
JournalCarbohydrate Polymers
Volume271
DOIs
Publication statusPublished - 1 Nov 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Acylation
  • Breathability
  • Cellulose
  • Hydrophobicity
  • Multibranched perfluoro-t-butoxy carboxylic acid
  • Transparency

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