高温热处理落叶松木材尺寸稳定性及结晶度分析表征  

Analysis and Characterization of Dimensional Stability and Crystallinity of Heat-Treated Larix spp.

作　　者：孙伟伦[1] 李坚[1] 

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《林业科学》2010年第12期114-118,共5页Scientia Silvae Sinicae

基　　金：黑龙江省自然科学基金重点项目(200808-01)

摘　　要：对以热处理介质为空气和N2下落叶松木材(热处理温度180～240℃,热处理时间4 h)的抗胀缩率(ASE)、结晶度及红外光谱进行测定和表征。结果表明:相同热处理时间下,随着热处理温度的升高,在180～220℃范围内,无论热处理介质是空气或N2时,落叶松木材的ASE值均达60%以上,介质为N2的木材的ASE值低于空气的;红外吸收光谱表明,3 380 cm-1附近—OH基团的伸缩振动强度随着热处理温度的升高而减少且变化显著,1 730 cm-1附近羰基随温度的升高吸收强度降低,相同条件下N2保护下羟基和羰基吸收峰强度高于空气的;落叶松木材在热处理时间相同的情况下,经过不同超高温度的处理后,木材结晶度的变化趋势是先增加、后减小、再增加,结晶度可达65%以上,同等条件下,N2氛围下木材的结晶度高于空气的。The ASE,crystallinity and characteristic of FTIR of super heat-treated Larix spp.（heat-treated temperature ranging from 180 to 240 ℃,heat-treated time was 4 h） were determined and characterized by the research.Results showed： the value of ASE increased along with the heat temperature increasing ranging from 180 to 220 ℃ and was beyond 60%,but when the heat-treated medium was nitrogen,the value of ASE was lower than that of air.The spectrum of FTIR demonstrated that the stretching vibration of —OH groups at 3 380 cm-1 was diminished accompanying the enhancing heat temperature and obviously changed.The relative intensity of carbonyl group at 1 730 cm-1 decreased with the increasing temperature.At the same treated situation,the hydroxide and carbonyl groups in the nitrogen were lower than those of oxygen.The tendency of crystallinity of super heat-treated Larix spp.was firstly increased,then decreased and finally increased.The value of crystallinity in the nitrogen was higher than that of air and over 65% under identical circumstances.

关 键 词：落叶松 热处理 尺寸稳定性 结晶度 红外光谱 

分 类 号：S781[农业科学—木材科学与技术]