文献类型：期刊文献

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

作者：Sun, Bailing[1] Wang, Zhe[1] Liu, Junliang[1]

第一作者：孙柏玲

通信作者：Liu, JL[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2017

卷号：63

期号：2

起止页码：133-139

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000400392500002)】；

基金：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.

语种：英文

外文关键词：Eucalyptus pellita; Thermo-vacuum treatment; Chemical changes; Dynamic water vapour sorption

摘要：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 degrees 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.