文献类型：期刊文献

英文题名：Deep eutectic solvents-assisted wood densification: A promising strategy for shape-fixation

作者：Ran, Yangyang[1,2] Lu, Dan[1,2] Jiang, Jianyi[1,2] Huang, Yuxiang[3] Wang, Wang[1,2] Cao, Jinzhen[1,2]

第一作者：Ran, Yangyang

通信作者：Wang, W[1]

机构：[1]Beijing Forestry Univ, Beijing Key Lab Wooden Mat Sci & Applicat, Beijing 100083, Peoples R China;[2]Beijing Forestry Univ, MOE Key Lab Wooden Mat Sci & Applicat, Beijing 100083, Peoples R China;[3]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2023

卷号：471

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20232614328427);Scopus(收录号：2-s2.0-85163466436);WOS:【SCI-EXPANDED(收录号:WOS:001030498300001)】；

基金：This work was largely supported by the National Natural Science Foundation of China (No. 32071696). We are also grateful to the Research Institute of Wood Industry, Chinese Academy of Forestry for providing plantation-grown radiata pine wood, and Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University for providing the confocal Raman microscope service.

语种：英文

外文关键词：Densified wood; Deep eutectic solvent (DES); Shape-fixation; Repolymerization; Relaxation of internal stress

摘要：Densified wood is preferable for structural applications because of its excellent mechanical properties and sustainability, but the fixation of its compression deformation and the prevention of water-induced mechanical deterioration remain challenging. Herein, an eco-friendly and highly efficient method was designed for producing dimensionally-stable densified wood, including deep eutectic solvent (DES) pretreatment and subsequent temperature-assisted compression. Hemicellulose, amorphous cellulose, and lignin were in-situ depolymerized or modified by DES pretreatment, and then they were repolymerized or recondensed by temperature-assisted compression to form a crosslinking network to achieve deformation fixation. This DES-assisted densified wood showed a lower set recovery rate (4.7% vs. 69.8%) and higher bending strength (173.7 MPa vs. 69.2 MPa) than densified natural wood. Moreover, its surface hardness could be maintained at a higher level even after a watersoaking/boiling test due to its excellent dimensional stability. DES pretreatment could be considered as a suitable and green strategy for producing high-strength structural wood with excellent dimensional stability.