Wood Science and Technology

, Volume 44, Issue 4, pp 533–546 | Cite as

Accessibility, reactivity and supramolecular structure of E. globulus pulps with reduced xylan content

  • R. Petra Wollboldt
  • Gerhard Zuckerstätter
  • Hedda K. Weber
  • Per Tomas Larsson
  • Herbert Sixta
Original
First Online:
Received:

Abstract

The correlation of structural assembly on a molecular level with macroscale properties such as accessibility and reactivity was investigated. A series of TCF-bleached E. globulus kraft dissolving pulps was prepared aiming at a specification suitable for viscose application. The removal of xylan to a comparable level was achieved by different pre- and post-treatments. Solid-state CP-MAS 13C NMR was used to determine the degree of order and the lateral fibril dimensions of cellulose fibrils. The results of the NMR measurements were related to the processability of these pulps during viscose manufacture, expressed in terms of filterability of the viscose dope and its amount of undissolved particles. The cellulose crystallinity did not affect the pulp reactivity. It was noticed that the cold caustic extracted (CCE) pulps revealed both large fibril aggregate width as determined from NMR data and low reactivity toward xanthation at the same time. These pulps exhibited significantly higher amounts of alkali-resistant xylan than those prepared by prehydrolysis kraft cooking.

Keywords

Kraft Pulp Pulp Sample Water Retention Value Xylan Content Sulfite Pulp 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

We gratefully acknowledge Dr. Antje Potthast for the measurement of FDAM-labelled samples. Financial support was provided by the Austrian government, the provinces of Lower Austria, Upper Austria, and Carinthia as well as by the Lenzing AG. We also express our gratitude to the Johannes Kepler University, Linz, the University of Natural Resources and Applied Life Sciences, Vienna, and the Lenzing AG for their in-kind contributions. Author P.T. Larsson acknowledges the Wallenberg Wood Science Centre in Sweden for financial support.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • R. Petra Wollboldt
    • 1
  • Gerhard Zuckerstätter
    • 1
  • Hedda K. Weber
    • 1
  • Per Tomas Larsson
    • 2
  • Herbert Sixta
    • 3
  1. 1.Kompetenzzentrum Holz GmbHLinzAustria
  2. 2.Innventia ABStockholmSweden
  3. 3.Department of Forest Products TechnologyAalto UniversityEspooFinland

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