文献类型：期刊文献

英文题名：The hygroscopic behavior of surface compressed wood in response to superheated steam treatment at varying steam pressures

作者：Xiang, Elin[1] Jin, Xiaobei[2] Li, Jing[1] Huang, Rongfeng[1]

第一作者：Xiang, Elin

通信作者：Huang, RF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Int Ctr Bamboo & Rattan, Beijing 100102, Peoples R China

年份：2024

卷号：216

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20242116116374);Scopus(收录号：2-s2.0-85193448564);WOS:【SCI-EXPANDED(收录号:WOS:001345681600001)】；

基金：This work was supported by the National Nature Science Foundation of China (Grant No. 32071690) .

语种：英文

外文关键词：Poplar wood; Surface compression; Superheated steam treatment; Steam pressures; Hygroscopic behavior

摘要：Superheated steam treatment has been shown to be an efficient strategy for enhancing the dimensional stability of compressed wood. This study evaluated the hygroscopic behavior of surface compressed (SC) wood subjected to superheated steam treatment (SHTSC wood) at varying steam pressures (0.1 MPa, 0.3 MPa, 0.5 MPa, and 0.7 MPa). As the steam pressure increased, the equilibrium moisture content (EMC) of SHTSC wood showed a gradual decrease throughout the hygroscopic range, indicating improved hygroscopic stability. The reduction in EMC for SC wood was associated with a decrease in polylayer moisture content (Ms) from 0% to 95% RH, while the EMC reduction for SHTSC wood was attributed to the combined effect of diminished monolayer (Mh) and Ms. The superheated steam treatment resulted in a range of chemical alterations in the SHTSC wood, including a decrease in hemicelluloses content and the quantity of sorption sites (-OH, C-O groups). Concurrently, there was a relative augmentation in the content of cellulose and extractives, alongside a heightened degree of lignin crosslinking. Furthermore, the superheated steam treatment also affected the cellular structure of the SHTSC wood, resulting in an increased ratio of macropores to mesopores, as well as the formation of microcracks within the cell wall. These changes became more pronounced as the steam pressure elevated, contributing to the reduced hygroscopic characteristics and improved dimensional stability of SHTSC wood.