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Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp

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Published/Copyright: June 9, 2012
Holzforschung
From the journal Holzforschung Volume 66 Issue 8

Abstract

Eucalyptus pulp is increasingly used for the manufacture of printing papers. However, its major drawback, the vessel picking, is still waiting for a solution. The detailed features and the characteristic behaviour of vessel elements (VEs) in pulp and paper processes are poorly understood. This study focusses on the chemistry, surface chemistry and morphology of eucalyptus VEs. These properties were followed through the changes introduced by different stages of elemental chlorine-free (ECF) bleaching, by studying separated VEs. Microprobe X-ray photoelectron spectroscopy (μ-XPS) and field emission-scanning electron microscopy (FE-SEM) were applied to elucidate the surface chemical composition and morphological ultrastructure, respectively. The bulk chemical composition was investigated among others by Py-GC/MS. Lignin was detected in vessels still after completed bleaching sequence, whereas the fibres were lignin-free. The vessel lignin was mainly composed by syringyl-type units. Surface coverage by lignin and amount of surface anionic groups were practically unaffected by bleaching. The vessel cell wall structure was observed to be layered in a complex way with no particular orientation of cellulose fibrils, and the different layers seemed to be exfoliated during different bleaching stages.

Keywords: chemical pulp; ECF bleaching; FE-SEM; μ-XPS; vessel picking
Corresponding author. Åbo Akademi University, Laboratory of Fibre and Cellulose Technology, Porthansgatan 3, FI-20500 Turku/Åbo, Finland
Received: 2011-6-10
Accepted: 2012-5-2
Published Online: 2012-06-09
Published in Print: 2012-12-01

©2012 by Walter de Gruyter Berlin Boston

Articles in the same Issue

  1. Masthead
  2. Masthead
  3. Original Papers
  4. Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
  5. Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
  6. Analysis of DCM extractable components from hot-pressed hybrid poplar
  7. Pretreatment of softwood dissolving pulp with ionic liquids
  8. Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
  9. Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
  10. Tensile creep and recovery of Norway spruce influenced by temperature and moisture
  11. Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
  12. Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
  13. Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
  14. Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
  15. Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
  16. Effect of quat- and amino-silicones on fungal colonisation and decay of wood
  17. Copper precipitation of Cu-monoethanolamine preservative in wood
  18. Short Note
  19. Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
  20. Erratum
  21. Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
  22. Meetings
  23. Meetings
https://doi.org/10.1515/hf-2011-0117
Keywords for this article
chemical pulp; ECF bleaching; FE-SEM; μ-XPS; vessel picking

Articles in the same Issue

  1. Masthead
  2. Masthead
  3. Original Papers
  4. Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
  5. Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
  6. Analysis of DCM extractable components from hot-pressed hybrid poplar
  7. Pretreatment of softwood dissolving pulp with ionic liquids
  8. Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
  9. Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
  10. Tensile creep and recovery of Norway spruce influenced by temperature and moisture
  11. Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
  12. Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
  13. Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
  14. Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
  15. Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
  16. Effect of quat- and amino-silicones on fungal colonisation and decay of wood
  17. Copper precipitation of Cu-monoethanolamine preservative in wood
  18. Short Note
  19. Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
  20. Erratum
  21. Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
  22. Meetings
  23. Meetings
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