摘要
以毛白杨人工林木材为研究对象,采用蒸汽介质热处理方法,在氧气含量低于2%的密闭干燥箱内进行木材热处理,研究了处理温度170～230℃、处理时间1～5h的热处理条件下,木材的化学成分含量及成分变化。结果表明:随着处理温度的提高和处理时间的延长,综纤维素和α-纤维素含量降低,而木质素含量表现出增加的趋势;处理温度比处理时间对毛白杨化学成分含量的影响更显著;综纤维素和α-纤维素含量发生显著变化的临界温度为200℃,处理时间为2h。另外,采用傅立叶红外变换光谱分析木材主要组分变化的原因,发现表征木材纤维素和半纤维素的官能团特征吸收峰强度减弱,而表征木质素的官能团特征吸收峰强度增强。采用多元回归分析方法,建立了毛白杨木材综纤维素、α-纤维素、木素含量损失率与处理温度、处理时间之间的数学回归模型,其决定系数均在0.9以上,在0.01水平上显著相关。可见,该模型可以预测出不同处理条件下热处理材化学成分含量的变化。
Using a heating device with an inside content of oxygen of less than 2%,Chinese white poplar（Populus tomentosa Carr.） specimens were heat-treated at temperatures ranging from 170℃ to 230℃ for periods lasting from 1 to 5 h.Relationships between the chemical composition of heat-treated wood and treatment conditions were investigated.The results show that the amount of holocellulose and α-cellulose decreased,but that of lignin increased with increases in temperature and time during the heat treatment.Compared to the heating time,the heating temperature had a greater effect on the amounts of chemical composition.The critical condition for the marked changes in the amount of holocellulose and α-cellulose is the heating temperature of 200℃ for a period of 2 h.Using Fourier Transform Infrared Spectroscopy（FT-IR）,the analysis indicated that the intensity of the characteristic absorption peaks of cellulose and hemicellulose decreased and those of lignin increased as a function of increasing temperature and time.Based on our experimental data,regression models were developed to predict the change of chemical composition（holocellulose,α-cellulose and lignin） for different temperatures and times.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2010年第3期155-160,共6页
Journal of Beijing Forestry University
基金
“948”国家林业局引进项目(2006-4-C03)
关键词
毛白杨
热处理
化学成分含量
回归模型
Chinese white poplar
heat treatment
chemical composition
regression model
