文献类型：期刊文献

英文题名：Effect of delignification on shrinking and swelling of poplar wood assessed using digital image correlation technique

作者：Li, Rui[1] Sun, Fengze[1] Wang, Wendi[1] Tang, Jun[2] Peng, Hui[1] Li, Zhu[2] Jiang, Jiali[2] Zhan, Tianyi[1] Cai, Liping[1] Lyu, Jianxiong[1]

第一作者：Li, Rui

通信作者：Lyu, J[1]

机构：[1]Nanjing Forestry Univ, Coll Mat Sci & Engn, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing 210037, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2025

卷号：289

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：;EI(收录号：20245217567820);Scopus(收录号：2-s2.0-85212548126);WOS:【SCI-EXPANDED(收录号:WOS:001392559700001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2023YFD2200501) .

语种：英文

外文关键词：Wood; Moisture; Delignification; Shrinking; Swelling; Digital image correlation

摘要：This study investigates lignin's influence on the hygroscopic behavior of poplar wood. Delignification was achieved using an acidic NaClO2 solution, and digital image correlation (DIC) was employed to measure strain distribution during shrinking and swelling across relative humidity (RH) ranging of 0 % to 97 %. Results showed that lignin removal increased equilibrium moisture content (EMC) by up to 3.6 % in samples with 27 % lignin reduction. Strain analysis revealed significant radial strain differences between earlywood and latewood, with tangential strain suppressed by wood rays. Increased porosity and cellulose slippage were observed following lignin removal, and samples with the highest lignin removal rate exhibited reduction exhibited over 58 % greater epsilon xxand over 43 % greater epsilon yy compared to untreated wood. These effects were most pronounced in latewood and regions distant from wood rays, where stress concentrations occurred. Delignification-induced cell wall thinning amplified the wood rays' inhibitory effect on anisotropic deformation during shrinking,enhancing the contrast between isotropic deformation in latewood and anisotropic deformation in earlywood during swelling. These findings provide insights into lignin's role in wood-water interactions, supporting the optimization of wood modification techniques.