Chemical, water vapour sorption and ultrastructural analysis of Scots pine wood thermally modified in high-pressure reactor under saturated steam

Chemical, water vapour sorption and ultrastructural analysis of Scots pine wood thermally... Thermal modification of wood results in improved dimensional stability and increases the end-use possibilities of wood. Modification under saturated steam is reported to result in higher performance when compared to more traditional thermal modification methods. This study analyses the chemical and ultrastructural changes, as well as water vapour sorption properties of Scots pine modified thermally in a high-pressure reactor under saturated steam. The aim is to reveal important chemical and sorption-related changes in wood modified under saturated steam. Chemical composition, water vapour sorption properties, accessibility and concentration of cellulosic hydroxyl groups, as well as evolution of cell wall are discussed. At a temperature of 180 °C, clear cell wall delamination and distortion were observed. In nanoscale, the results indicated opening of microfibril bundles, which leads to higher surface area and theoretically, a higher accessibility. However, a decrease in the equilibrium moisture content and accessibility of both extracted and unextracted samples were observed, but the decrease was less obvious in extracted samples.Hence, it was concluded that extractives and degradation products play an important role during thermal modification by blocking porosity and therefore decreasing accessibility and reducing sorption of thermally modified samples. The changes in hysteresis behaviour after extraction also support this outcome. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Chemical, water vapour sorption and ultrastructural analysis of Scots pine wood thermally modified in high-pressure reactor under saturated steam

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-017-1714-1
Publisher site
See Article on Publisher Site

Abstract

Thermal modification of wood results in improved dimensional stability and increases the end-use possibilities of wood. Modification under saturated steam is reported to result in higher performance when compared to more traditional thermal modification methods. This study analyses the chemical and ultrastructural changes, as well as water vapour sorption properties of Scots pine modified thermally in a high-pressure reactor under saturated steam. The aim is to reveal important chemical and sorption-related changes in wood modified under saturated steam. Chemical composition, water vapour sorption properties, accessibility and concentration of cellulosic hydroxyl groups, as well as evolution of cell wall are discussed. At a temperature of 180 °C, clear cell wall delamination and distortion were observed. In nanoscale, the results indicated opening of microfibril bundles, which leads to higher surface area and theoretically, a higher accessibility. However, a decrease in the equilibrium moisture content and accessibility of both extracted and unextracted samples were observed, but the decrease was less obvious in extracted samples.Hence, it was concluded that extractives and degradation products play an important role during thermal modification by blocking porosity and therefore decreasing accessibility and reducing sorption of thermally modified samples. The changes in hysteresis behaviour after extraction also support this outcome.

Journal

Journal of Materials ScienceSpringer Journals

Published: Oct 23, 2017

References

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