文献类型：期刊文献

英文题名：Moisture sorption and its induced deformation of juvenile wood at different radial positions in poplar wood at the tissue scale

作者：Yin, Fangyu[1] Zhou, Yongdong[1] Zhou, Fan[1] Huang, Saisai[1] Gao, Xin[1] Fang, Xuan[1]

第一作者：Yin, Fangyu

通信作者：Zhou, YD[1]

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

年份：2024

卷号：220

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20243416914230);Scopus(收录号：2-s2.0-85201498541);WOS:【SCI-EXPANDED(收录号:WOS:001297918400001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (No. 2023YFD2200502) .

语种：英文

外文关键词：Poplar; Juvenile wood; Wetwood; Hygroscopic deformation; Response relationship; GAB model

摘要：Juvenile wood exhibits significant variations in its properties across the radial direction, which responds strongly to water and can impact its applications in various scenarios. Wetwood, a specific presence in juvenile wood, is more prevalent in certain species. In this study, we focused on poplar (Populus x euramericana cv. 'San Martino') and analyzed the moisture content (M) and hygroscopic deformation of juvenile wood near the pith (wetwood) and in juvenile wood near the bark (normal wood) in real-time at the tissue scale (earlywood and latewood). To achieve this, we employed a dynamic vapor sorption analyzer in combination with a Dino-Lite Edge digital microscope. By utilizing the Guggenheim-Andersen-de Boer (GAB) model and the Kelvin equation, we examined the relationship between the bound water and hygroscopic deformation. The results revealed that the M in green condition of wetwood was significantly higher than that of normal wood. However, the disparity in moisture sorption capacity between wetwood and normal wood below the fiber saturation point contributed only minimally to this phenomenon. Regarding for hygroscopic deformation, it was observed that not all wetwood samples exhibited a greater shrinkage/swelling compared to normal wood samples. This variation can be attributed to structural factors, such as differences in microfibril angle, crystallinity, and cell wall ratios. Furthermore, it was found that the swelling ratio caused by 1 % of bound water (SwR-B) increased with rising relative humidity (RH) within the range of 0-90 % RH. However, the SwR-B stabilized or slightly decreased in the range of 90 %-95 % RH. This behavior is believed to be linked to the formation of capillary condensed water at higher humidity levels. Additionally, we found that the swelling ratio resulting from 1 % of polylayer water exceeded that caused by 1 % of monolayer water.