文献类型：期刊文献

英文题名：Microwave treatment of Eucalyptus grandis × urophylla: Effects of comprehensive chemical and structural changes on the hygroscopic behavior of eucalyptus

作者：Zhang, Yongle[1] Zhang, Yu[1] Lin, Lanying[1] Zhou, Yongdong[1] Fu, Feng[1]

第一作者：Zhang, Yongle

机构：[1] Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, China

年份：2025

外文期刊名：Drying Technology

收录：EI(收录号：20254419402688);Scopus(收录号：2-s2.0-105019784829)

语种：英文

外文关键词：Chemical stability - Degradation - Hardwoods - Hydrophilicity - Microwave heating - Moisture - Moisture determination

摘要：Microwave treatment enhances the hygroscopic stability of fast-growing Eucalyptus grandis × urophylla through the synergistic effect of chemical and structural evolution. This study explored the moisture response of earlywood and latewood after microwave treatment, revealing the mechanism of reduced hygroscopicity caused by the coupling of structural and compositional changes. The experimental results showed that the equilibrium moisture content of both earlywood and latewood of Eucalyptus was suppressed under different humidity gradients, and the reduction in earlywood was greater than that in latewood. From a chemical perspective, hemicellulose deacetylation and lignin cross-linking dominated the process of reduced hygroscopicity by consuming hydrophilic groups (–OH/–COOH) and stabilizing the hydrogen bond network. From a structural perspective, steam-induced mesopore expansion and microcrack formation, but these physical changes did not lead to reduced hygroscopicity. Instead, the contradiction between enlarged pores (theoretically conducive to capillary condensation) and suppressed equilibrium moisture content highlights the dominant role of chemical pathway regulation. These findings indicate that the reduction in hygroscopicity of microwave-treated eucalyptus stems from the reduction of chemical hydrophilic group sites and the suppression of capillary effects, which provides a new way to optimize the dimensional stability of tropical hardwood with energy conservation. ? 2025 Taylor & Francis Group, LLC.