Study on the changes in surface characteristics of <Emphasis Type="Italic">Populus tomentosa</Emphasis> due to thermo-hydro-process |
| |
| Authors: | Minzhen Bao Xianai Huang Mingliang Jiang Neng Li Yanglun Yu Wenji Yu |
| |
| Institution: | 1.Key Laboratory of Wood Science and Technology of State Forestry Administration, Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing,People’s Republic of China;2.China National Bamboo Research Center, Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province,Hangzhou,People’s Republic of China;3.CanmetENERGY-Ottawa, Natural Resource Canada,Ottawa,Canada |
| |
| Abstract: | 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 °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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
