Journal of Wood Science

, Volume 63, Issue 2, pp 133–139 | Cite as

Changes of chemical properties and the water vapour sorption of Eucalyptus pellita wood thermally modified in vacuum

Original article

Abstract

The aim of this study was to evaluate the chemical composition and the dynamic water vapour sorption properties of Eucalyptus pellita wood thermally modified in vacuum. For this purpose, wood samples were thermally modified in a vacuum oven at 160–240 °C for 4 h. Chemical composition were investigated by wet chemical analysis, elemental analysis, as well as Fourier transform infrared (FTIR) analysis, and dynamic water vapour sorption properties were evaluated by dynamic vapour sorption apparatus. The results showed that holocellulose and alpha-cellulose contents decreased and lignin and extractives contents relatively increased during the heat process. Elemental analysis showed a reduction in hydrogen content and an increase in carbon content. FTIR analysis indicated that the degradation of hemicellulose and condensation reactions of lignin occurred. In addition, the thermo-vacuum resulted in a reduction in the equilibrium moisture content of wood during the adsorption or desorption process. And the sorption hysteresis had a decreasing trend with increasing treatment temperature. The development of the hygroscopicity was related to the increase in the relative content of lignin, the degradation of the carbonyl groups in xylan and the loss of carbonyl group linked to the aromatic skeleton in lignin after heat treatment.

Keywords

Eucalyptus pellita Thermo-vacuum treatment Chemical changes Dynamic water vapour sorption 

Notes

Acknowledgements

The authors would like to thank the Chinese National Natural Science Foundation for financial support of the project “Thermal effect and mechanism of wood under vacuum heat treatment”, Grant No. 31370558.

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Copyright information

© The Japan Wood Research Society 2017

Authors and Affiliations

  1. 1.Research Institute of Wood IndustryChinese Academy of ForestryBeijingChina

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