title: Highly hydrophobic biopolymers prepared by the surface pentafluorobenzoylation of cellulose substrates.
abstract: 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.
authors: CICECO and Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
authors: Ana G
authors: AG
authors: Cunha
authors: Carmen S R
authors: CS
authors: Freire
authors: Armando J D
authors: AJ
authors: Silvestre
authors: Carlos
authors: C
authors: Pascoal Neto
authors: Alessandro
authors: A
authors: Gandini
authors: Elina
authors: E
authors: Orblin
authors: Pedro
authors: P
authors: Fardim
mesh_terms: 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
chemical_list: D001565:Benzoates; D002482:Cellulose; D011108:Polymers; C014737:pentafluorobenzoyl chloride; D005464:Fluorobenzenes; D005466:Fluorocarbons