Carboxyl groups in pre-treated regenerated cellulose fibres

Lidija Fras Zemljič*, Zdenka Peršin, Peer Stenius, Karin Stana Kleinschek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The influence of peroxide bleaching and slack-mercerization on the amount of acidic groups in regenerated fibres (viscose, modal and lyocell) were studied. Conductometric titration was used to determine the total content of acidic carboxylic groups. Polyelectrolyte titration was used for surface and total charge determination, and to obtain information about the charge distribution and accessibilities of charged groups. Changes in fibre crystallinity to pre-treatment processes were characterized using iodine sorption (Schwertassek method) and correlated to treatments and the amount of carboxylic groups. For all three types of fibres the amount of accessible carboxyl groups was lowered by an increase in the degree of crystallinity. Bleaching with hydrogen peroxide causes some oxidative cellulose damage and, therefore, a larger amount of carboxyl groups (presumably formed at the end of cellulose chains). Slack-mercerization did not significantly change the total amount of acidic groups in the fibres, but their accessibility to cationic polyelectrolytes, in particular to polymers with high molecular weight was substantially lowered.

Original languageEnglish
Pages (from-to)681-690
Number of pages10
Issue number5
Publication statusPublished - 14 Apr 2008
Externally publishedYes


  • Carboxylic groups
  • Cellulose fibres
  • Conductometric titration
  • Crystallinity
  • Polyelectrolyte titration
  • Pre-treatment
  • Regenerated fibres

ASJC Scopus subject areas

  • Polymers and Plastics


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