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Issue 9, 2011
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Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts

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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)2py][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.

Graphical abstract: Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts

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Publication details

The article was received on 19 Apr 2011, accepted on 02 Jun 2011 and first published on 18 Jul 2011


Article type: Paper
DOI: 10.1039/C1GC15432J
Green Chem., 2011,13, 2464-2470

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    Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts

    L. C. Tomé, M. G. Freire, L. P. N. Rebelo, A. J. D. Silvestre, C. P. Neto, I. M. Marrucho and C. S. R. Freire, Green Chem., 2011, 13, 2464
    DOI: 10.1039/C1GC15432J

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