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 Preparation and characterization of novel highly omniphobic cellulose fibers organic-inorganic hybrid materials
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5131

title: Preparation and characterization of novel highly omniphobic cellulose fibers organic-inorganic hybrid materials
authors: Cunha, Ana G.
Freire, Carmen S.R.
Silvestre, Armando J.D.
Neto, Carlos Pascoal Neto
Gandini, Alessandro
keywords: Heterogeneous cellulose fiber modification
3-Isocyanatopropyl
triethoxysilane
Siloxanes
Tetraethoxysilane
1H,1H,2H,2H-Perfluorodecyltriethoxysilane
Organic–inorganic hybrids
Hydrophobicity
Lipophobicity
Omniphobicity
issue date: 2010
publisher: Elsevier
abstract: This paper reports the preparation of class-II organic-inorganic hybrid materials by the heterogeneous chemical modification of cellulose fibers with (3-isocyanatopropyl)triethoxysilane, followed by the acid hydrolysis (and condensation) of the appended siloxane moieties as such, and in the presence of either tetraethoxysilane or 1H,1H,2H,2H-perfluorodecyltriethoxysilane. These modifications produced an inorganic "coating" around the fibers, while preserving their ultrastructure, as confirmed by XRD and SEM. The detailed characterization of these new hybrid materials by FTIR and (29)Si NMR showed that, upon hydrolysis of the ethoxy groups, condensation reactions took place leading mainly to Si-O-Si linear sequences, followed by a smaller contribution of more branched moieties, and that a significant amount of OH groups were also formed, which gave rise to hydrophilic surfaces. The hybrids obtained by hydrolysis in the presence of 1H,1H,2H,2H-perfluorodecyltriethoxysilane displayed a very pronounced hydrophobic and lipophobic character (reaching contact angles with water and diiodomethane as high as 140 degrees and 134 degrees, respectively), due to the presence of the perfluorinated moieties. (C) 2010 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/10773/5131
ISSN: 0144-8617
publisher version/DOI: http://dx.doi.org/10.1016/j.carbpol.2010.01.023
source: Carbohydrate Polymers
appears in collectionsDQ - Artigos

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