林业工程学报2016，Vol.1Issue(5)：15-19,5.DOI:10.13360/j.issn.2096-1359.2016.05.003
基于拉曼光谱分析的热处理松木吸湿机理研究
A theoretical study of moisture sorption behavior of heat-treated pine wood using Raman spectroscopic analysis
摘要
Abstract
As an effective modification method, heat treatment improves the dimensional stability of wood by lowering its hygroscopicity. The degradation of hemicelluloses and the increase of cellulose crystallinity are believed to be the main reasons for the property changes, while the contribution of lignin is still not fully understood. Some suggested that the condensation of lignin occured during the heat treatment process, the cross⁃linking structure thus was formed and made the wood being hydrophobic. Others questioned it and suggested other lignin reaction types. In this study, dynamic water vapor sorption experiments were carried out on heat⁃treated and untreated southern pine wood. The chemical compositions of both samples were analyzed using Raman spectroscopy to investigate the mechanism after the property modification. The results showed that the heat treatment not only lowered the sorption amount of the treated wood but also altered the pattern of its sorption process, which was demonstrated by the decrease of the change of moisture content as a function of relative humidity and the increase in sorption hysteresis of the heat⁃treated wood. All these indicated the dimensional sta⁃bility improvement of heat⁃treated wood even in a condition with greatly varied humidity. Raman spectroscopy analysis in⁃dicated that lignin was one of the key factors affecting the sorption behavior of the heat⁃treated wood. Heat treatment in⁃creased the content of lignin in the cell walls and changed its structure. As a result, a more rigid cell wall was formed, which hindered wood from moisture sorption and made the hysteresis more significant.关键词
木材热处理/动态水蒸气吸附/拉曼光谱分析/平衡含水率/吸湿滞后Key words
wood heat treatment/dynamic water vapor sorption/Raman spectroscopic analysis/equilibrium moisture content/sorption hysteresis分类
化学化工引用本文复制引用
丁涛,王长菊,彭文文..基于拉曼光谱分析的热处理松木吸湿机理研究[J].林业工程学报,2016,1(5):15-19,5.基金项目
国家林业公益性行业科研专项（201404504）；江苏高校品牌专业建设工程资助项目（TAPP）。 （）
