文献类型：期刊文献

英文题名：Changes in the properties of wood cell walls during the transformation from sapwood to heartwood

作者：Song, Kunlin[1] Yin, Yafang[1] Salmen, Lennart[2] Xiao, Fuming[3] Jiang, Xiaomei[1]

第一作者：Song, Kunlin

通信作者：Yin, YF[1]

机构：[1]Chinese Acad Forestry, Wood Anat & Utilizat Dept, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Innventia AB, S-11486 Stockholm, Sweden;[3]Jiangxi Acad Forestry, Nanchang 330032, Jiangxi, Peoples R China

年份：2014

卷号：49

期号：4

起止页码：1734-1742

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20140217185996);Scopus(收录号：2-s2.0-84891625342);WOS:【SCI-EXPANDED(收录号:WOS:000328327600032)】；

基金：This study was sponsored by the Chinese State Forestry Administration Project (201104058) and the Chinese National Natural Science Foundation (No. 30972303). Gratitude goes to the following: Mingkun Xu and Lin Liu from the Chinese Research Institute of Wood Industry for the preparation of the samples, Anne-Mari Olsson of Innventia AB for her technical help when making the Dynamic Mechanical Analysis and dynamic vapour sorption, Dr. Jasna S. Stevanic of Innventia AB, Professor Tefu Qin and Dr. Yanming Han of Chinese Research Institute of Wood Industry for their valuable advice on imaging FTIR spectroscopy. Acknowledgement must also go to the support given to Lennart Salmen from the Wallenberg Wood Science Center (WWSC).

语种：英文

外文关键词：Activation energy - Biopolymers - Cells - Cytology - Ethylene - Ethylene glycol

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.