文献类型：期刊文献

英文题名：Characterization of Microstructure, Chemical, and Physical Properties of Delignified and Densified Poplar Wood

作者：Wang, Jiajun[1,2,3] Liu, Junliang[1] Li, Jianzhang[2] Zhu, J. Y.[3]

第一作者：Wang, Jiajun

通信作者：Li, JZ[1];Zhu, JY[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China;[3]USDA, Forest Prod Lab, Madison, WI 53726 USA

年份：2021

卷号：14

期号：19

外文期刊名：MATERIALS

收录：;EI(收录号：20214010979135);Scopus(收录号：2-s2.0-85116084258);WOS:【SCI-EXPANDED(收录号:WOS:000707992900001)】；

基金：This work was supported by the Fundamental Research Funds of CAF (Grant No. CAFYBB2021QA002).

语种：英文

外文关键词：delignification; densification; microstructure; chemistry; dimensional stability

摘要：Wood is an attractive and inherently sustainable alternative to many conventional materials. Recent research on improving wood mechanical strength emphasizes wood densification through the partial removal of lignin and hemicelluloses, therefore the chemical and physical properties of delignified and densified wood require further investigation. In this study, poplar wood samples were subjected to alkali and maleic acid hydrotropic delignification with varying degrees of lignin and hemicellulose removal followed by hot pressing, and the microstructure, chemical properties, and dimensional stability of densified wood through delignification were evaluated. The results showed that the complete wood cell collapse was observed near the surface of all the delignified wood blocks, as well as some micro-cracks in the cell walls. The chemical analysis indicated that delignification occurred mainly near the surface of the wood blocks and enhanced hydrogen bonding among the aligned cellulose fibers. For dimensional stability, the set recovery decreased with the increase in alkali dosage, and the considerable fixation of compressive deformation was obtained by a post-densification hydrothermal treatment at 180 degrees C. These results have demonstrated that the densified wood with delignification can be easily fabricated using the proposed method, and the densified wood exhibited great potential to be used as a sustainable material.