期刊
CARBOHYDRATE POLYMERS
卷 271, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118031
关键词
Cellulose; Acylation; Transparency; Hydrophobicity; Breathability; Multibranched perfluoro-t-butoxy carboxylic acid
资金
- Spanish Ministerio de Ciencia, Innovacion y Universidades [RTI2018-096896-J-I00, RYC2018-025079-I/AEI]
- European Regional Development Fund, ERDF
- European Social Fund, ESF
- project NiFTy, PRIN2017 [2017MYBTXC]
Cellulose ester films were prepared by esterifying cellulose with multibranched fluorinated carboxylic acid at different molar ratios. The films showed varying morphological and optical properties, as well as different degrees of substitution (DS) and mechanical behaviors. The presence of BRFA groups shifted the mechanical behavior from rigid to ductile and soft, and the films exhibited wettability similar to standard fluoropolymers.
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 degrees 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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