文献类型：期刊文献

英文题名：Change in Micromechanical Behavior of Surface Densified Wood Cell Walls in Response to Superheated Steam Treatment

作者：Xiang, Elin[1] Huang, Rongfeng[1] Yang, Shumin[2]

第一作者：Xiang, Elin

通信作者：Huang, RF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, State Forestry & Grassland Adm, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China;[2]Int Ctr Bamboo & Rattan, Bamboo & Rattan Sci & Technol Lab, Beijing 100102, Peoples R China

年份：2021

卷号：12

期号：6

外文期刊名：FORESTS

收录：;EI(收录号：20212410514848);Scopus(收录号：2-s2.0-85107894569);WOS:【SCI-EXPANDED(收录号:WOS:000666065000001)】；

基金：This research was funded by the Nature Science Foundation of China (Grant Nos. 32071690; 31670557).

语种：英文

外文关键词：surface densified wood; superheated steam treatment (SHT); cell wall; creep behavior; nanoindentation (NI)

摘要：The combination of surface densification and superheated steam treatment is an effective method to improve the mechanical properties and dimensional stability of low-density wood. The objective of the current work is to evaluate the effects of superheated steam treatment on the micromechanical behavior of surface densified wood. The microstructure, chemical composition, cellulose crystalline structure, and micromechanical behavior of surface densified wood under different superheated steam pressures were investigated. Results indicated that both 0.1 MPa and 0.3 MPa superheated steam treatments increased the elastic modulus and hardness of fiber cell walls in surface densified wood. However, the average creep ratio and maximum creep compliance J(50) of surface densified wood under 0.3 MPa decreased by 41.59% and 6.76%, respectively, compared with untreated wood. The improvement of elastic modulus, hardness and creep resistance of surface densified wood treated with superheated steam was associated with the increase of relative crystallinity (CrI) and crystalline size. In addition, 0.3 MPa superheated steam treatment displayed a better effect on the enhancement of the elastic modulus, hardness, and creep resistance of the fiber cell wall than 0.1 MPa superheated steam treatment.