Bi-phobic cellulose fibers derivatives via surface trifluoropropanoylation.
The surface modification of cellulose fibers with 3,3,3-trifluoropropanoyl chloride (TFP) was studied in a toluene suspension. The characterization of the modified fibers was performed by elemental analysis, Fourier transform infrared (FTIR), 13C-solid-state NMR, X-ray diffraction, thermogravimetry, and surface analysis (XPS, ToF-SIMS, and contact angles measurements). The degree of substitution (DS) of the ensuing trifluoropropanoylated fibers ranged from less than 0.006 to 0.30, and in all instances the fibers' surface acquired a high hydrophobicity and lipophobicity resulting from a drastic reduction in its energy. The hydrolytic stability of these cellulose derivatives was also evaluated and shown to be permanent in time in the presence of neutral water, still appreciable in basic aqueous solution at pH 9, but, as expected quite poor at pH 12.
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*; D009682:Magnetic Resonance Spectroscopy; D011422:Propionates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014961:X-Ray Diffraction
D011422:Propionates; D002482:Cellulose