Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts
authors Tome, LC; Freire, MG; Rebelo, LPN; Silvestre, AJD; Neto, CP; Marrucho, IM; Freire, CSR
nationality International
journal GREEN CHEMISTRY
keywords NANOFIBRILLATED CELLULOSE; BARRIER PROPERTIES; FATTY-ACIDS; ACETYLATION; MEMBRANES; BEHAVIOR; WATER
abstract The surface hydrophobization through heterogeneous chemical modification of bacterial (and vegetable) cellulose fibers with several anhydrides (acetic, butyric, hexanoic and alkenyl succinic anhydrides) and hexanoyl chloride suspended in an ionic liquid, tetradecyltrihexylphosphonium bis(trifluoromethylsulfonyl) imide, [TDTHP][NTf2], was studied. Furthermore, in the reaction with hexanoyl chloride, another ionic liquid, N-hexyl-4-(dimethylamino)pyridinium bis(trifluoromethylsulfonyl) imide, [C6N(CH3)(2)py][NTf2], was used instead of common organic bases as catalyst and to trap the released HCl. The analysis of the ensuing modified fibers by FTIR, XRD and SEM clearly showed that the esterification reactions occurred essentially at the fibers' outmost layers, not affecting their ultrastructure. The degree of substitution (DS) of the ensuing esterified fibers ranged from less than 0.002 to 0.41; and in all instances, the fibers' surface acquired a high hydrophobicity. This novel approach constitutes an important strategy in the preparation of modified fibers under greener conditions relaying in the use of non-volatile solvents.
publisher ROYAL SOC CHEMISTRY
issn 1463-9262
year published 2011
volume 13
issue 9
beginning page 2464
ending page 2470
digital object identifier (doi) 10.1039/c1gc15432j
web of science category Chemistry, Multidisciplinary; GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
subject category Chemistry; Science & Technology - Other Topics
unique article identifier WOS:000294437300031
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journal analysis (jcr 2019):
journal impact factor 9.48
5 year journal impact factor 9.707
category normalized journal impact factor percentile 92.662
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