Abstract
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.
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Acknowledgments
We thank the Finnish Centre for International Mobility (CIMO), which provided financial support for this work and Prof. Janne Laine from Laboratory of Forest Products Chemistry for scientific discussion. We also thank Katja Routanen and Ritva Kivelä, Laboratory of Forest Products Chemistry, as well as Tanja Kos and Vida Žižek, Laboratory for Characterization and Processing of Polymers, for their skilful technical assistance.
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Lidija Fras Zemljič, Zdenka Peršin, and Karin Stana Kleinschek are the members of the European Polysaccharide Network of Excellence (EPNOE).
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Zemljič, L.F., Peršin, Z., Stenius, P. et al. Carboxyl groups in pre-treated regenerated cellulose fibres. Cellulose 15, 681–690 (2008). https://doi.org/10.1007/s10570-008-9216-6
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DOI: https://doi.org/10.1007/s10570-008-9216-6