文献类型：期刊文献

英文题名：Sandwich compression of wood: effect of superheated steam treatment on sandwich compression fixation and its mechanisms

作者：Xiang, Elin[1] Feng, Shanghuan[2] Yang, Shumin[3] 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, Key Lab Wood Sci & Technol, State Forestry & Grassland Adm, Beijing 100091, Peoples R China;[2]Zeroignit Technol Inc, Res & Dev Discovery Ctr, Coquitlam, BC V3K 5Z6, Canada;[3]Int Ctr Bamboo & Rattan, Bamboo & Rattan Sci & Technol Lab, Beijing 100102, Peoples R China

年份：2020

卷号：54

期号：6

起止页码：1529-1549

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20204309379627);Scopus(收录号：2-s2.0-85092783036);WOS:【SCI-EXPANDED(收录号:WOS:000579711300001)】；

基金：The authors acknowledge financial support from the Nature Science Foundation of China (Grant Nos. 31670557; 32071690), and the National Nonprofit Institute Research Grant of CAF (No. CAFYBB2018ZC003).

语种：英文

外文关键词：Cellulose - Chemical analysis - Crystallinity - Molecular biology - Recovery - Steam

摘要：The permanent fixation is essential for the full industrialization of sandwich-compressed wood. In this study, sandwich-compressed wood was modified with superheated steam for compression fixation. Effects of superheated steam pressure on set-recovery were investigated. Changes in microstructure, chemical structure and cellulose crystalline structure of the compressed wood were analyzed, to clarify the reason and mechanism for sandwich compression fixation under superheated steam treatment. It was found that set-recovery of central-compressed wood was higher than that of surface-compressed wood. Effects of superheated steam treatment on set-recovery were statistically significant (P < 0.05). Higher superheated steam pressure contributed to lower set-recovery, but the extent of the impact of superheated steam pressure depended on the pressure levels and the reasons causing the set-recovery (exposure to high humidity, immersion in water or boiling in water). The decreased set-recovery was related to micro-cracks in the cell wall, degradation of hemicelluloses, loss of the C=O linked to the aromatic skeleton in lignin and increase in crystallinity. This research demonstrated that superheated steam treatment is effective in permanently fixing the compression of sandwich-compressed wood.