Lidija Fras Zemljič (Author), Leena Sisko Johansson (Author), Peer Stenius (Author), Janne Laine (Author), Karin Stana-Kleinschek (Author), Volker Ribitsch (Author)

Abstract

The purpose of this study was to evaluate the effect of selective oxidation on the surface properties of cotton cellulose fibres. Four different methods to evaluate the accessibility, nature and content of ionisable acidic groups (charge) in the fibres were applied: potentiometric and conductometric titrations, polyelectrolyte adsorption and X-ray photoelectron spectroscopy (XPS). The results from this combination of methods show that two processes take place when the oxidation method is applied: elimination of low molecular mass non-cellulosic compounds and formation of new acidic groups in the cellulose chains. Which of these processes is predominating depends on oxidation time, but the first one is initially more important. Polyelectrolyte adsorption and XPS show that the surface concentration of acidic groups is considerably lower than the bulk concentration, i.e. during oxidation the content of carboxyl groups in the surface region decreases, while it increases in amorphous regions. The decrease is due to the dissolution of low molecular weight compounds; the increase is due to the formation of new acidic groups. The use of titration methods in combination with XPS appears to be a very useful tool for identification of the formation and distribution of ionic groups in cotton fibres and their surfaces.

Keywords

tekstilna vlakna;bombažna vlakna;celulozna vlakna;oksidacija;kislinske skupine v vlaknih;rentgenska fotoelektronska spektroskopija;XPS;textile fibres;cotton fibres;cellulose fibres;oxidation;X-ray photoelectron spectroscopy;acid groups in fibres;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 541.183:677.21.016.027.62
COBISS: 9655318 Link will open in a new window
ISSN: 0927-7757
Views: 1787
Downloads: 102
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Other data

Secondary language: English
Secondary keywords: tekstilna vlakna;bombažna vlakna;celulozna vlakna;oksidacija;kislinske skupine v vlaknih;rentgenska fotoelektronska spektroskopija;XPS;
URN: URN:SI:UM:
Pages: str. 101-108
Volume: ǂVol. ǂ260
Issue: ǂiss. ǂ1/3
Chronology: 15 June 2005
ID: 8718304