文献类型：期刊文献

英文题名：Swelling behavior of thermally modified timber from a cellular and chemical perspective

作者：Gao, Yufa[1,2] Zhou, Yongdong[1] Fu, Zongying[1] Van den Bulcke, Jan[2] Van Acker, Joris[2]

第一作者：Gao, Yufa

通信作者：Fu, ZY[1];van den Bulcke, J[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Natl Forestry & Grassland Adm, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China;[2]Univ Ghent, Fac Biosci Engn, Dept Environm, Lab Wood Technol,Univ Gent Woodlab, Coupure Links 653, B-9000 Ghent, Belgium

年份：2023

外文期刊名：HOLZFORSCHUNG

收录：;EI(收录号：20233114471883);Scopus(收录号：2-s2.0-85166189831);WOS:【SCI-EXPANDED(收录号:WOS:001031176300001)】；

基金：This work wasfinanced by a grant-in-aidfor scientific research from the Youth Program of National Natural Science Foundation of China (no. 31800478).

语种：英文

外文关键词：cell swelling; cellulose; chemical constituents; crystallinity; heat-treated wood; hygroscopicity

摘要：Thermally modified timber (TMT) reduces hygroscopicity, increases dimensional stability, and decay resistance. Although there is a substantial amount of research on heat-treated wood, investigations on the sensitivity of cell wall swelling behavior to water variation are limited. Therefore, this study focused on the swelling behavior of TMT from cellular and chemical perspectives. The effects of heat treatment on the hygroscopicity and swelling behavior of the wood cell walls were studied using dynamic vapor sorption and confocal laser scanning microscopy. Changes in the chemical composition and cellulose crystallinity were studied using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction. The results revealed that the hygroscopic swelling of latewood significantly decreased with increasing treatment temperature, reducing the anisotropy of the wood cell swelling. The hygroscopicity of wood was reduced by heat treatment, and a clear decrease in hysteresis was observed at elevated treatment temperatures. The FTIR spectra indicated that both hemicellulose and lignin were degraded. The crystallinity and lateral size of the cellulose increased after heat treatment. Similar changes in the chemical composition and crystallinity of cellulose were observed in the latewood and earlywood.