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当前位置: 首页 > 文章 > 基于拉曼光谱分析的热处理松木吸湿机理研究 林业工程学报 2016,1 (5) 15-19
Position: Home > Articles > A theoretical study of moisture sorption behavior of heat-treated pine wood using Raman spectroscopic analysis Journal of Forestry Engineering 2016,1 (5) 15-19

基于拉曼光谱分析的热处理松木吸湿机理研究

作  者：
丁涛;王长菊;彭文文
单  位：
南京林业大学材料科学与工程学院
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
摘  要：
木材热处理可以显著降低木材的吸湿性,是提高其尺寸稳定性的有效改性方法。以南方松热处理材和对照材为试材进行动态水蒸气吸附试验,并借助拉曼光谱对两种试材的化学组分进行比较,探索热处理对木材吸湿性能的改性机理。结果表明:在本试验条件下,热处理不仅降低了木材的吸湿量,也改变了其吸湿特性,表现为热处理材平衡含水率变化率的降低和吸湿滞后性的增强。在实际应用中,这表明热处理材即使在环境湿度变化较大的情况下也能保持较好的尺寸稳定性。拉曼光谱分析表明,木素的结构变化是热处理材形成其吸湿特性的主要内在原因之一。热处理后木素在细胞壁中的相对含量有所上升,结构发生了重组,使木材细胞壁结构变得更加稳固而缺乏弹性,对木材的吸湿和平衡起到了阻滞作用。
译  名：
A theoretical study of moisture sorption behavior of heat-treated pine wood using Raman spectroscopic analysis
作  者：
DING Tao;WANG Changju;PENG Wenwen;College of Materials Science and Engineering,Nanjing Forestry University;
关键词：
wood heat treatment;;dynamic water vapor sorption;;Raman spectroscopic analysis;;equilibrium moisture content;;sorption hysteresis
摘  要：
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 stability improvement of heat-treated wood even in a condition with greatly varied humidity. Raman spectroscopy analysis indicated that lignin was one of the key factors affecting the sorption behavior of the heat-treated wood. Heat treatment increased 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.

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