文献类型：期刊文献

英文题名：Thermal modification-induced degradation and toughness reduction of bamboo: Insights into multi-scale structural and interfacial changes

作者：Chu, Shimin[1] Li, Yunqi[1] Lin, Lanying[1] Zhang, Yu[1] Zhang, Yongle[1]

第一作者：Chu, Shimin

通信作者：Lin, LY[1]

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

年份：2025

卷号：240

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20252718702817);Scopus(收录号：2-s2.0-105009344352);WOS:【SCI-EXPANDED(收录号:WOS:001524397200002)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2023YFD2200502) .

语种：英文

外文关键词：Bamboo; Thermal modification; Degradation; Toughness

摘要：While thermal modification benefits bamboo stability and microbial resistance, its toughness reduction mechanisms are not fully understood. In this study, the multi-scale structural and interfacial degradation of bamboo during thermal modification were analyzed, with a focus on the tensile failure characteristics at cell-wall scale. An innovative in-situ loading device combined with Fourier transform infrared spectroscopy was employed to enable real-time tracking of cellulose conformation during stretching process. The results indicated that thermal modification induced significant changes in the multi-scale structures and interfaces of bamboo, including the degradation of hemicellulose and amorphous cellulose, and the crosslinking and condensation of lignin. Additionally, thermal modification reconfigured the hydrogen bonding network of cellulose. These changes led to increased indentation modulus and hardness of cell walls, elevated storage modulus, decreased loss modulus, and loss factor. Toughness decreased significantly, characterized by loss of the elastoplastic stage and markedly reduced maximum tensile strain. Additionally, tensile strength and elastic modulus decreased by 69.4 % and 34 %, respectively, compared to the control. The results of in-situ tensile Fourier transform infrared spectroscopy showed that thermal modification inhibited the shear slip between cellulose microfibrils and changed the strain distribution during the tensile process. The crosslinking and condensation of lignin, coupled with a reconfiguration of the cellulose hydrogen bonding network, inhibited shear slip between cellulose microfibrils, weakened crack blunting and deflection mechanisms, leading to reduced toughness in thermally modified bamboo. This provides a theoretical basis for understanding TMB degradation and insights for designing high-strength, hightoughness biomaterials.