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

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

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)278-281
Number of pages4
JournalHolzforschung
Volume63
Issue number3
DOIs
Publication statusPublished - 1 May 2009
MoE publication typeNot Eligible

Keywords

  • Brightness reversion
  • Eucalyptus
  • Kraft pulp
  • Lignin
  • Reflectance UV-Vis spectroscopy
  • UV resonance Raman (UVRR) spectroscopy

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