文献类型：期刊文献

英文题名：Effects of Pressurized Superheated Steam Treatment on Dimensional Stability and Its Mechanisms in Surface-Compressed Wood

作者：Gao, Zhiqiang[1,2] Huang, Rongfeng[2]

第一作者：Gao, Zhiqiang

通信作者：Gao, ZQ[1];Gao, ZQ[2]

机构：[1]Xichang Univ, Coll Agr Sci, Xichang 615000, Peoples R China;[2]Chinese Acad Forestry, Key Lab Wood Sci & Technol State Forestry & Grass, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2022

卷号：13

期号：8

外文期刊名：FORESTS

收录：;EI(收录号：20223712730545);Scopus(收录号：2-s2.0-85137595003);WOS:【SCI-EXPANDED(收录号:WOS:000846129400001)】；

基金：This research was funded by the Nature Science Foundation of China, formation mechanism and controllability of wood sandwich compression by hydro-thermal control (Grant No. 31670557) and permanent fixation of wood plastic deformation by a pressurized heating medium containing superheated steam, and its mechanism & applicability (Grant No. 32071690).

语种：英文

外文关键词：surface compression; pressurized superheated steam; dimensional stability; fixation mechanism

摘要：Shape stability is one of the most important properties of surface-compressed wood used as a substitute for other energy-intensive adhesives, concrete, and metals. This study evaluated the dimensional stability, surface wettability, chemical structure, cellulose crystalline structure, and microstructure of surface-compressed wood. The surface-compressed wood was then treated with pressurized superheated steam. The equilibrium moisture content, thickness swelling ratio, and wettability of the wood decreased by 20.39%, 30.63% (moisture absorption), 40.51% (water absorption), and 86.95% after pressurized superheated steam treatment, respectively. In the pressurized steam environment, hemicelluloses were significantly degraded, significantly reducing the strong hygroscopic groups, particularly hydroxyl groups. The crystallinity and crystal width of cellulose in the compressed wood also increased by 8.02% and 37.61%, respectively, after pressurized superheated steam treatment, corresponding to dimensional stability. Dimensional stability, namely the shape fixation of the surface-compressed wood, is a complex mechanism, including the hydrophobization of cell walls, the formation of cross-linkages, the reformation of microfibril chains, microstructural changes, and the relaxation of inner stresses, which reduced or even eliminated the recovery. This study demonstrates that pressurized steam treatment can effectively enhance dimensional stability in surface-compressed wood, which contributes to the substantial use of surface-compressed wood in the building and construction industries. We will further explore the relationship and mechanism between superheated steam pressure, treatment time, and dimensional stability.