Analysis of the oxidation of cellulose fibres by titration and XPS

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

Research output: Contribution to journalArticleResearchpeer-review

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.

Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume260
Issue number1-3
DOIs
Publication statusPublished - 15 Jun 2005
Externally publishedYes

Keywords

  • Acid groups in fibres
  • Cellulose fibres
  • Cotton fibres
  • Oxidation of fibres
  • Titrations of fibres
  • XPS of fibres

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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