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Licensed Unlicensed Requires Authentication Published by De Gruyter July 18, 2006

The formation of aromatic end group structures in O-alkyl substituted celluloses under alkaline pulping conditions

Anne Vikkula and Tapani Vuorinen
From the journal

Abstract

UV resonance Raman (UVRR) spectroscopy was used to study changes in the structure of reducing end groups of O-alkyl substituted celluloses under conditions simulating the initial phase of soda pulping. The derivatives studied were carboxymethyl cellulose (CMC) with a degree of substitution (DS) of 0.58 and methyl cellulose (MC) with DS of 1.64–1.95. Hot alkaline treatments were carried out in solutions of sodium hydroxide (0.1–1 M) at 95°C in the presence of creosol as a lignin model compound. Alkali-stable aromatic end groups were generated in both cellulose ethers. Moreover, the end groups of methyl cellulose were extensively condensed with creosol. The results demonstrate that aromatisation and condensation depend on the pH and reaction time.

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Corresponding author: Laboratory of Forest Products Chemistry, Department of Forest Products Technology, Helsinki University of Technology, P.O. Box 6400, FIN-02150 Espoo, Finland Fax +358-9-4514259

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Published Online: 2006-07-18
Published in Print: 2006-07-01

©2006 by Walter de Gruyter Berlin New York