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 language | English |
|---|---|
| Pages (from-to) | 278-281 |
| Number of pages | 4 |
| Journal | Holzforschung |
| Volume | 63 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 May 2009 |
| MoE publication type | Not Eligible |
Funding
The authors thank Ms. Tiina Rauhala for skilful experimental work with UV Raman spectroscopy. The financial support from the Finnish Funding Agency for Technology and Innovations (TEKES), Andritz, Jaakko Pöyry, Kemira Chemicals, Metsä-Bot-nia and Stora Enso is gratefully acknowledged. A.S.J. and A.L. thank the Academy of Finland for financial support.
Keywords
- Brightness reversion
- Eucalyptus
- Kraft pulp
- Lignin
- Reflectance UV-Vis spectroscopy
- UV resonance Raman (UVRR) spectroscopy
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