Highly hydrophobic biopolymers prepared by the surface pentafluorobenzoylation of cellulose substrates.
New highly hydrophobic/lipophobic biopolymers were prepared by the controlled heterogeneous pentafluorobenzoylation of cellulose substrates, i.e., plant and bacterial cellulose fibers. The characterization of the modified fibers was performed by elemental analysis, FTIR spectroscopy, X-ray diffraction, thermogravimetry, and surface analysis (XPS, ToF-SIMS, and contact angle measurements). The degree of substitution of the ensuing pentafluorobenzoylated fibers ranged from 0.014 to 0.39. The hydrolytic stability of these perfluorinated cellulose derivatives was also evaluated and showed that they were quite water stable, although of course the fluorinated moieties could readily be removed by hydrolysis in an aqueous alkaline medium.
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
Pascoal Neto
Carlos
C
Gandini
Alessandro
A
Orblin
Elina
E
Fardim
Pedro
P
D001565:Benzoates / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D006868:Hydrolysis; D057927:Hydrophobic and Hydrophilic Interactions; D015394:Molecular Structure; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014961:X-Ray Diffraction; D005464:Fluorobenzenes; D005466:Fluorocarbons
D001565:Benzoates; D002482:Cellulose; D011108:Polymers; C014737:pentafluorobenzoyl chloride; D005464:Fluorobenzenes; D005466:Fluorocarbons