文献类型：期刊文献

英文题名：The Study of Bound Water Status and Pore Size Distribution of Chinese Fir and Poplar Cell Wall by Low-Field NMR

作者：Cao, Huimin[1] Lyu, Jianxiong[1] Zhou, Yongdong[1] Gao, Xin[1] Lu, Yun[1]

第一作者：Cao, Huimin

通信作者：Gao, X[1]|[a0005b25f74bb2a7734bd]高鑫;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dongxiaofu 1,Xiangshan Rd, Beijing 100091, Peoples R China

年份：2021

卷号：2021

外文期刊名：INTERNATIONAL JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20214511122494);Scopus(收录号：2-s2.0-85114646198);WOS:【SCI-EXPANDED(收录号:WOS:000693881400001)】；

基金：This research was sponsored by the National Natural Science Foundation of China (31971591) and National Key Research and Development Program of China (2017YFD0600202).

语种：英文

外文关键词：Adsorption - Adsorption isotherms - Forestry - Nuclear magnetic resonance - Nuclear magnetic resonance spectroscopy - Pore structure - Size distribution - Temperature - Water vapor - Wood

摘要：With the increasing shortage of timber resources and the advancement of environmental protection projects, many artificial fast-growing forests are planted and used as raw materials in China. There are significant differences in the properties of natural forest wood and artificial fast-growing forest wood, and the properties of wood mainly depend on the change in the status of bound water in the cell wall. In this study, the fiber saturation point (FSP) and pore size distributions within the cell wall of six species of fast-growing forest wood were studied by low-temperature nuclear magnetic resonance (NMR) technology. The effects of species, growth rings, and extractives on the FSP and pore structure were analyzed. The water vapor sorption experiments were performed, and the adsorption isotherms of the samples were fitted through the Guggenheim-Anderson-de Boer (GAB) equation. According to the least-square regression of the adsorption isotherms and combined with the low-temperature NMR experiments, the content and proportion of the different types of bound water were analyzed. The results showed that the average FSP of each Chinese fir was about 40% and that of each poplar was about 35%. There is about a 10% difference between the FSP measured by NMR technology and the adsorption bound water content obtained by adsorption isothermal. The pore size distribution results show that in all samples, the proportion of pores larger than 10.5 nm is very low, about 10%; the proportion of 1.92-10.5 nm pores is about 30%; and the proportion of pores smaller than 1.92nm is more than 50%. This work will be helpful to the study of the wood moisture status and provide reference data for wood modification.