杉木间伐材高温热处理后化学成分的变化  

Changing Rules of Components of Cunninghamia lanceolata Thinning Wood in Heat Treating Process

作　　者：邓邵平[1] 江茂生[2] 陈孝云[1] 谢拥群[1] 

机构地区：[1]福建农林大学材料工程学院,福州350002 [2]福建农林大学生命科学学院,福州350002

出　　处：《林业科学》2009年第11期121-126,共6页Scientia Silvae Sinicae

基　　金：福建省科技平台建设项目(2008H2002);福建省教育厅科学基金资助项目(JA08057)

摘　　要：以空气和菜子油为介质,分别用180,200和220℃处理杉木间伐材2和4h,测定处理样综纤维素、纤维素、Klason木质素和苯醇抽出物相对含量的变化,并用傅里叶变换红外光谱分析高温热处理过程中木材内综纤维素的变化规律。结果表明:热处理后试材综纤维素含量均有不同程度的降低、纤维素总体降低较少,相应的苯醇抽出物含量、Klason木质素含量增加;温度升高、处理时间延长,木材主要化学组成的变化程度增大;在隔氧的油介质中进行热处理,试件的化学成分变化程度低于空气介质中热处理材;方差分析表明不同温度、时间、介质对主要化学组成产生极显著的影响;FTIR分析表明,180℃热处理时开始发生半纤维素分解,到200℃时纤维素也开始分解;氧气氛围对糖残基的热分解具有促进作用。在3412,1050,898cm-1附近相关糖残基,1736cm-1附近相关C■O以及2907cm-1附近对应C—H的吸收强度的变化也表征出热处理过程中各化学成分的变化规律。In this paper,the chemical changes of the cunninghamia lanceolata thinning wood treated in hot air and hot vegetable oil respectively for different processing temperatures and times were analyzed by chemical component analysis and FTIR analysis.The results showed that there were different degree decreases in the content of the holocellulose of treated samples during the heat treatment compared to reference samples,as the whole the content of the degraded cellulose of treated samples was smaller,meanwhile,the content of both of benzene-alcohol and Klason lignin of treated samples were increased.The chemical compositions of treated samples vary much when processing temperature was increased and times was lengthened during the heat treatment.In addition,the effect of heat medium on the chemical changes of treated samples was obvious,and the chemical changes of the samples when the treatment of hot oil appeared to be slightly lower than that of samples when the treatment of hot air under the same condition.Analysis variance showed that chemical compositions of treated samples among different processing temperatures,processing times and different heat medium reached highly significant difference.The FTIR of specimens indicated that the hemicellulose decomposed firstly when wood samples treated at 180 ℃,and some degradation of the cellulose was occurred at temperature of 200 ℃.The degradation of polysaacharide was accelerated in atmosphere.The variations of absorption intensity both of glucosidic bonds at 3 412,1 050,898 cm-1and carbonyl peak at 1 736 cm-1 and C—H bond stretching at 2 907 cm-1 can reflect the variations in the chemical compositions of the samples when the treatment for different processing times and temperatures,it showed a good correlation between the variations in the chemical compositions of the samples and the improved dimensional stability of heat treated wood.

关 键 词：杉木间伐材 热处理 化学成分 加热介质 傅里叶变换红外光谱 

分 类 号：S781.7[农业科学—木材科学与技术]