Reactions of aromatic structures in brightness reversion of fully-bleached eucalyptus kraft pulps

Anna-Stiina Jääskeläinen; Katri Toikka; Anni Lähdetie; Tiina Liitiä; Tapani Vuorinen

doi:10.1515/HF.2009.047

Published by De Gruyter December 3, 2008

Reactions of aromatic structures in brightness reversion of fully-bleached eucalyptus kraft pulps

Anna-Stiina Jääskeläinen , Katri Toikka , Anni Lähdetie , Tiina Liitiä and Tapani Vuorinen

From the journal Holzforschung

https://doi.org/10.1515/HF.2009.047

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Abstract

The role of aromatic structures in brightness reversion of fully bleached pulps was studied by UV resonance Raman (UVRR) and reflectance UV-Vis spectroscopy. The results clearly showed that ageing increased the aromatic band at approximately 1600 cm^-1 in the UVRR spectra and the lignin band at approximately 280 nm in the UV-Vis spectra. This increase was probably due to increased conjugation of lignin and it was observed for all pulps regardless of the bleaching sequence. In addition to these lignin reactions, other unsaturated structures, such as hexenuronic acid groups, reacted during ageing.

Keywords: brightness reversion; eucalyptus; kraft pulp; lignin; reflectance UV-Vis spectroscopy; UV resonance Raman (UVRR) spectroscopy

Corresponding author. Department of Forest Products Technology, TKK Helsinki University of Technology, P.O. Box 6300, 02015 Espoo, Finland tiina.jaaskelainen@tkk.fi

Received: 2007-11-1

Accepted: 2008-10-20

Published Online: 2008-12-03

Published in Print: 2009-05-01

Reactions of aromatic structures in brightness reversion of fully-bleached eucalyptus kraft pulps

Abstract

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