Analysis of the oxidation of cellulose fibres by titration and XPS

Fras, Lidija; Johansson, Leena‐Sisko; Stenius, P.; Laine, Janne; Stana‐Kleinschek, Karin; Ribitsch, Volker

doi:10.1016/j.colsurfa.2005.01.035

Cited by 115 publications

(74 citation statements)

References 18 publications

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“…The results are in agreement with earlier studies of cellulosic materials (Soignet et al 1976;Ahmed et al 1987;Gellerstedt and Gatenholm 1999;Johansson et al 2004;Fras et al 2005;Mitchell et al 2005) and the well known fact that laminar layers of waxes, proteins and pectin, which originally more or less totally conceal the cellulose backbone, cover natural cotton fibers. It was shown by (Buchert et al 2001) that total removal of these ''natural passivation layers'' is very difficult indeed.…”

Section: Surface Chemical Effectssupporting

confidence: 92%

Analysis of the effects of catalytic bleaching on cotton

et al. 2007

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Hydrogen peroxide can be catalyzed to bleach cotton fibers at temperatures as low as 308C by incorporating dinuclear tri-l-oxo bridged manganese(IV) complex of the ligand 1,4,7-trimethyl-1,4,7-triazacyclononane (MnTACN) as the catalyst in the bleaching solution. The catalytic system was found to be more selective under the conditions applied than the non-catalytic H 2 O 2 system, showing better bleaching performance while causing slightly lower decrease in degree of polymerization (DP) of cellulose. In order to gain fundamental knowledge of the bleach effect on cotton fibers and cellulose as its main component, especially after catalytic bleaching, X-ray Photoelectron Spectroscopy (XPS) was used to study surface chemical effects. The Washburn method was applied to investigate wetting properties, and liquid porosity was used to obtain pore volume distribution (PVD) plots. Parallel analyzes performed on model cotton fabric, i.e. ''clean'' cotton fabric stained with morin -a pigment regularly found in native cotton fiber, helped to differentiate between pigment oxidation and other bleaching effects produced on the (regular) industrially scoured cotton fabric. Bleaching was not limited to the chemical action but also affected cotton fiber capillary parameters most likely due to the removal of non-cellulosic materials as well as chain-shortened cellulose.

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Section: Surface Chemical Effectssupporting

confidence: 92%

Analysis of the effects of catalytic bleaching on cotton

et al. 2007

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“…4) show intense O 1s signals at around 533.2 eV and an intense C 1s peak at around 286.7 eV. Ca peaks are observed in the spectra of both non-modified and TMA-NFC, which is common for natural celluloses derived from cotton or straw sources (Fras et al 2005). In addition, in the spectrum of TMA-NFC, weak N and Cl signals emerge.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Preparation and characterization of cationic nanofibrillated cellulose from etherification and high-shear disintegration processes

et al. 2011

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Oat straw cellulose pulp was cationized in an etherification reaction with chlorocholine chloride. The cationized cellulose pulp was then mechanically disintegrated in two process steps to obtain trimethylammonium-modified nanofibrillated cellulose (TMA-NFC). The materials thus obtained were analyzed by elemental analysis, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and other techniques. A higher nitrogen content of TMA-NFC samples was found by XPS analysis than by elemental analysis, which indicates that the modification occurred mainly on the surface of cellulose fibrils. XPS also confirmed the existence of ammonium groups in the samples. SEM provided images of very fine network structures of TMA-NFC, which affirmed the positive effect of ionic charge on mechanical disintegration process. According to XRD and SEM results, no severe degradation of the cellulose occurred, even at high reaction temperatures. Because of the different properties of the cationic NFC compared to negatively charged native cellulose fibers, TMA-NFC may find broad applications in technical areas, for instance in combination with anionic species, such as fillers or dyes. Indeed, TMA-NFC seems to improve the distribution of clay fillers in NFC matrix.

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“…Chitosan was applied after oxidation of cotton fabric by hydrogen peroxide and subsequently stabilized by reducing agent such as sodium cyanoborohydride or sodium borohydride show improved dyeability with reactive dyes (Weltrowski and Masri 1996). Potassium periodate is known to selectively convert 1,2-dihydroxyl groups to a pair of aldehyde groups without significant side reaction and is widely used in structural analysis of carbohydrates (Varma et al 1985;Varma and Chavan 1995;Kim et al 2000;Varma and Kulkarni 2002;Fras et al 2005). This oxidizing agent was used successfully for surface oxidation of cotton fiber prior to the treatment with chitosan to produce chitosan coated cotton fiber (Liu et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Treatment of oxidized cellulose fabric with chitosan and its surface activity towards anionic reactive dyes

2008

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The surface modification of cellulose fabric with chitosan was achieved through an oxidation of the fabric with KIO 4 followed by reductive ammination with chitosan. The chitosan content in the fabric determined by Kjeldahl nitrogen analysis technique was 1.69%. The scanning electron micrograph revealed submicron particles of chitosan attached on the fabric surface. Dyeing of the modified fabrics with mono-chloro-triazine and vinyl sulfone anionic reactive dyes, showed vastly improved exhaustion and color yield (K/S) indicating that this method of surface modification is effective for changing surface activity of the fabric. The enhancement of the dye uptake brought about an improved dyeing process in which the dye and salt used could be reduced by half and 14%, respectively. A Significant drop in burst strength upon the oxidation but no discernable adverse color fastness property was observed for the chitosan-modified fabric.

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Analysis of the oxidation of cellulose fibres by titration and XPS

Cited by 115 publications

References 18 publications

Analysis of the effects of catalytic bleaching on cotton

Analysis of the effects of catalytic bleaching on cotton

Preparation and characterization of cationic nanofibrillated cellulose from etherification and high-shear disintegration processes

Treatment of oxidized cellulose fabric with chitosan and its surface activity towards anionic reactive dyes

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