文献类型：期刊文献

英文题名：Study on the changes in surface characteristics of Populus tomentosa due to thermo-hydro-process

作者：Bao, Minzhen[1,2] Huang, Xianai[3] Jiang, Mingliang[1] Li, Neng[1] Yu, Yanglun[1] Yu, Wenji[1]

第一作者：Bao, Minzhen

通信作者：Yu, YL[1];Yu, WJ[1]|[a0005b92a29b9f40edd99]余养伦;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol, State Forestry Adm, Xiang Shan Rd, Beijing 10091, Peoples R China;[2]China Natl Bamboo Res Ctr, Key Lab High Efficient Proc Bamboo Zhejiang Prov, Wen Yi Rd 310, Hangzhou 310012, Zhejiang, Peoples R China;[3]Nat Resource Canada, CanmetENERGY Ottawa, 1 Haanel Dr,Bldg 2,Room 101, Ottawa, ON K1A 1M1, Canada

年份：2018

卷号：64

期号：3

起止页码：264-278

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000433193900010)】；

基金：The authors appreciate the financial support from the National Nonprofit Institute Research Grant of CAFINT (CAFYBB2017ZX003).

语种：英文

外文关键词：Wood color; Roughness; Wettability; Thermo-hydro-mechanical process; Chemical characteristic

摘要：The effects of high temperature, moisture, and mechanical action during the thermo-hydro-mechanical (THM) processing, on the changes in surface properties of poplar, namely, surface color, roughness, wettability, and microstructure, were investigated in this study. The correlation between observed changes in surface properties and chemical characteristics was also analyzed. Poplar woods with high moisture content were compressed using different pressures at temperature of 160 A degrees C for four different periods. The wood surfaces became darker and smoother, and their surface free energy decreased significantly after the THM process. THM process markedly reduced surface hygroscopicity compared to the control wood. The cell lumens of THM wood became narrow with increasing compression ratio due to the enhancing high pressure. Collapse and fractures of cell walls developed during THM treatment. Furthermore, results indicated that a series of chemical reactions in different components of wood took place during THM process, such as degradation of hemicelluloses, condensation of lignin, and decomposition of extractives. In turn, these chemical modifications contributed to the darkening of color as well as the reduction of wettability and surface free energy of THM wood.