Changes in the properties of wood cell walls during the transformation from sapwood to heartwood

被引:0
|
作者
Kunlin Song
Yafang Yin
Lennart Salmén
Fuming Xiao
Xiaomei Jiang
机构
[1] Chinese Academy of Forestry,Wood Anatomy and Utilization Department, Research Institute of Wood Industry
[2] Innventia AB,undefined
[3] Jiangxi Academy of Forestry,undefined
来源
Journal of Materials Science | 2014年 / 49卷
关键词
Lignin; Dynamical Mechanical Analysis; Cellulose Microfibril; Moisture Sorption; Wood Cell Wall;
D O I
暂无
中图分类号
学科分类号
摘要
Changes in the chemical, viscoelastic and hygroscopic properties of wood cell walls in Chinese fir (Cunninghamia lanceolata) during the transition from sapwood to heartwood were studied to provide insights into the formation of heartwood. In situ imaging FTIR measurements indicated that the composition of the main components of cell walls remained almost unaltered, but more extractives were deposited in the wood cell walls during the sapwood–heartwood transition. Compared to the sapwood and transition wood, the heartwood had a higher softening temperature and greater activation energy, suggesting that the mobility restrictions of cell wall biopolymers were due to extractives obstructing the accessing of the plasticizer (ethylene glycol). The moisture sorption was the same from the sapwood to heartwood at a low relative humidity (RH), while the heartwood adsorbed less water at a high RH, probably caused by the extractives deposited in the matrix and mesopores of heartwood cell walls.
引用
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页码:1734 / 1742
页数:8
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