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- Title
Changes in the properties of wood cell walls during the transformation from sapwood to heartwood.
- Authors
Song, Kunlin; Yin, Yafang; Salmén, Lennart; Xiao, Fuming; Jiang, Xiaomei
- Abstract
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.
- Subjects
PLANT cell walls; CHINA fir; PLANT cells &; tissue analysis; VISCOELASTICITY; SAPWOOD; HEARTWOOD; ABSORPTION (Physiology); MOISTURE content of plants; PLANTS
- Publication
Journal of Materials Science, 2014, Vol 49, Issue 4, p1734
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-013-7860-1