Preparation and characterization of novel highly omniphobic cellulose fibers organic-inorganic hybrid materials
authors Cunha, AG; Freire, CSR; Silvestre, AJD; Neto, CP; Gandini, A
nationality International
journal CARBOHYDRATE POLYMERS
author keywords Heterogeneous cellulose fiber modification; (3-Isocyanatopropyl)triethoxysilane; Siloxanes; Tetraethoxysilane; 1H,1H,2H,2H-Perfluorodecyltriethoxysilane; Organic-inorganic hybrids; Hydrophobicity; Lipophobicity; Omniphobicity
keywords SOL-GEL PROCESS; FATTY-ACIDS; NANOCOMPOSITES; COMPOSITES; SUBSTITUTION
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 Si-29 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.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2010
volume 80
issue 4
beginning page 1048
ending page 1056
digital object identifier (doi) 10.1016/j.carbpol.2010.01.023
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000277636200006
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journal analysis (jcr 2019):
journal impact factor 7.182
5 year journal impact factor 6.89
category normalized journal impact factor percentile 96.638
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