Characterization and evaluation of the hydrolytic stability of trifluoroacetylated cellulose fibers.
The controlled heterogeneous modification of cellulose fibers with trifluoroacetic anhydride was investigated. The characterization of the ensuing materials was performed by elemental analysis, FTIR spectroscopy, X-ray diffraction (XRD), thermogravimetry, and surface analysis (XPS, ToF-SIMS, and contact angles measurements). The trifluoroacetylation enhanced significantly the hydrophobic and lipophobic character of the fibers, whereas their thermal stability and cristallinity were only modestly affected by this treatment, except under the most severe conditions for the latter. Their hydrolytic stability to water vapour was also assessed as a function of the air humidity and shown to be lower than that of still liquid water in the case of a saturated atmosphere.
Cunha
Ana G
AG
CICECO and Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
Freire
Carmen S R
CS
Silvestre
Armando J D
AJ
Neto
Carlos Pascoal
CP
Gandini
Alessandro
A
Orblin
Elina
E
Fardim
Pedro
P
D002482:Cellulose / Q000737:chemistry*; D006868:Hydrolysis; D012680:Sensitivity and Specificity; D018629:Spectrometry, Mass, Secondary Ion / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D014269:Trifluoroacetic Acid / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
D014867:Water; D002482:Cellulose; D014269:Trifluoroacetic Acid