Startseite Liquid sorption, swelling and surface energy properties of unmodified and thermally modified Scots pine heartwood after extraction
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Liquid sorption, swelling and surface energy properties of unmodified and thermally modified Scots pine heartwood after extraction

  • Susanna Källbom EMAIL logo , Maziar Sedighi Moghaddam und Magnus E.P. Wålinder
Veröffentlicht/Copyright: 18. November 2017
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Holzforschung
Aus der Zeitschrift Holzforschung Band 72 Heft 3

Abstract

The effect of extractives removal on liquid sorption, swelling and surface energy properties of unmodified wood (UW) and thermally modified Scots pine heartwood (hW) (TMW) was studied. The extraction was performed by a Soxtec procedure with a series of solvents and the results were observed by the multicycle Wilhelmy plate method, inverse gas chromatography (IGC) and Fourier transform infrared (FTIR) spectroscopy. A significantly lower rate of water uptake was found for the extracted UW, compared with the unextracted one. This is due to a contamination effect in the latter case from water-soluble extractives increasing the capillary flow into the wood voids, proven by the decreased water surface tension. The swelling in water increased after extraction 1.7 and 3 times in the cases of UW and TMW, respectively. The dispersive part of the surface energy was lower for the extracted TMW compared to the other sample groups, indicating an almost complete removal of the extractives. The FTIR spectra of the extracts showed the presence of phenolic compounds but also resin acids and aliphatic compounds.

Keywords: extractives; FTIR; inverse gas chromatography (IGC); liquid sorption; multicycle Wilhelmy plate method; Scots pine; surface energy; swelling; thermally modified wood

Acknowledgment

The authors would like to thank Dr. Sara Olsson at RISE, Division of Bioeconomy, in Stockholm, Sweden, for providing valuable knowledge and guidance in the FTIR analyses, and Dr. Dennis Jones, Dr. Kristoffer Segerholm and Dr. Kristiina Lillqvist for helpful input and discussions. Heatwood AB in Hudiksvall, Sweden, is acknowledged for providing the wood material. Financial support from the Swedish Research Council Formas (project EnWoBio 2014-172) is greatly acknowledged.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

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Supplemental Material:

The online version of this article offers supplementary material (https://doi.org/10.1515/hfh-2017-0064).

Received: 2017-04-28
Accepted: 2017-10-16
Published Online: 2017-11-18
Published in Print: 2018-02-23

©2018 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. The balance between alkali diffusion and alkali consuming reactions during impregnation of softwood. Impregnation for kraft pulping revisited
  4. Role of lignin and sodium carbonate on the swelling behavior of black liquor droplets during combustion
  5. Process optimization of lignin conversion into value added chemicals by thermochemical pretreatment and electrooxidation on a stainless steel anode
  6. Characterization of high-molar-mass fractions in a Scots pine (Pinus sylvestris L.) knotwood ethanol extract
  7. Discrimination of wood species based on a carbon nanotube/polymer composite chemiresistor array
  8. Characterization of moisture in acetylated and propionylated radiata pine using low-field nuclear magnetic resonance (LFNMR) relaxometry
  9. Effects of accelerated aging treatment on the microstructure and mechanics of wood-resin interphase
  10. Improved properties of thermally modified wood (TMW) by combined treatment with disodium octoborate tetrahydrate (DOT) and wax emulsion (WE)
  11. Liquid sorption, swelling and surface energy properties of unmodified and thermally modified Scots pine heartwood after extraction
https://doi.org/10.1515/hf-2017-0064
Schlagwörter für diesen Artikel
extractives; FTIR; inverse gas chromatography (IGC); liquid sorption; multicycle Wilhelmy plate method; Scots pine; surface energy; swelling; thermally modified wood

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. The balance between alkali diffusion and alkali consuming reactions during impregnation of softwood. Impregnation for kraft pulping revisited
  4. Role of lignin and sodium carbonate on the swelling behavior of black liquor droplets during combustion
  5. Process optimization of lignin conversion into value added chemicals by thermochemical pretreatment and electrooxidation on a stainless steel anode
  6. Characterization of high-molar-mass fractions in a Scots pine (Pinus sylvestris L.) knotwood ethanol extract
  7. Discrimination of wood species based on a carbon nanotube/polymer composite chemiresistor array
  8. Characterization of moisture in acetylated and propionylated radiata pine using low-field nuclear magnetic resonance (LFNMR) relaxometry
  9. Effects of accelerated aging treatment on the microstructure and mechanics of wood-resin interphase
  10. Improved properties of thermally modified wood (TMW) by combined treatment with disodium octoborate tetrahydrate (DOT) and wax emulsion (WE)
  11. Liquid sorption, swelling and surface energy properties of unmodified and thermally modified Scots pine heartwood after extraction
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