木材科学与技术2025，Vol.39Issue(4)：33-39,49,8.DOI:10.12326/j.2096-9694.2025013
过热蒸汽压力对表层压缩木材动态黏弹性的影响机制研究
Study on the Influence Mechanisms of Superheated Steam Pressures on Dynamic Viscoelastic Properties of Surface-Compressed Wood
摘要
Abstract
In this study,a combination of surface compression and superheated steam treatment was conducted to improve the properties of poplar(Populus tomentosa)sapwood.The effects of surface compression and varying steam pressures(180℃,0.1～0.7 MPa)on the cellular morphology and chemical structure of the surface-compressed wood were investigated using scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR).When the test temperature increased from 30℃to 300℃,the reduction in the relative storage modules of the permanent setting wood treated with superheated steam(referred to as the permanent setting wood)was significantly greater than that of the control wood and the compressed wood.Compared to compressed wood,at a lower steam pressure(≤0.3 MPa),the loss modulus of the permanent setting wood showed no significant changes.However,when the steam pressure exceeded 0.5 MPa,both the peak temperature and apparent activation energy of α mechanical relaxation loss gradually decreased along with the increasing of steam pressures,by 11～45℃and 22.89%～50.28%,respectively.After superheated steam treatment,deacetylation of hemicelluloses and lignin degradation reactions occurred in the compressed wood.This led to an increasing proportion of low molecular weight polymers and reducing the elasticity and viscosity recovery of the compressed wood.As a result,the dimensional stability was enhanced.The findings of this study provide a theoretical basis for the processing and utilization of surface-compressed wood with superheated steam treatment.关键词
木材/表层压缩/过热蒸汽压力/细胞结构/化学结构/动态黏弹性Key words
wood/surface compression/superheated steam pressure/cell wall structure/chemical structure/dynamic viscoelastic properties分类
农业科技引用本文复制引用
向娥琳,黄荣凤..过热蒸汽压力对表层压缩木材动态黏弹性的影响机制研究[J].木材科学与技术,2025,39(4):33-39,49,8.基金项目
国家自然科学基金项目"基于过热蒸汽压力和介质组成的木材塑性变形永久固定机理及其适用性"(32071690). （32071690）
