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

高温热处理落叶松木材尺寸稳定性及结晶度分析表征


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.


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