Gaseous decomposition products from wood degradation via thermogravimetric and fourier transform infrared analysis during thermal modification of beech and pine woods
Gaseous decomposition products from wood degradation via thermogravimetric and fourier transform infrared analysis during thermal modification of beech and pine woods
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DOI：
10.15376/biores.14.3.6883-6894
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发表时间：
2019-07
期刊：
影响因子：
1.5
通讯作者：
Zhengbin He;Zhengyu Wang;Lijie Qu;Jing Qian;Song-lin Yi
中科院分区：
文献类型：
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作者：
Zhengbin He;Zhengyu Wang;Lijie Qu;Jing Qian;Song-lin Yi
木材热改性是一种环境友好的改良木材性能的方法，其降解机理直接影响其在建筑、建筑和家居装饰中的应用。采用热重法和傅立叶变换红外光谱(TG-FTIR)相结合的方法，在160℃和220℃的温度下对阔叶木和针叶木进行了现场评价。结果表明，阔叶木和针叶木的质量损失率(MLRs)都随着时间的推移而下降，并最终趋于恒定。总质量损失随着温度的升高而增加。在160℃时，总质量损失约为3%，在220℃时，总质量损失约为4.7%~6.5%，且阔叶木比针叶木更容易发生分解。阔叶木产生的气体产物种类比针叶木材多，且随着温度的升高和处理时间的延长，气体产物的种类增多。在不同温度下，针叶木的FTIR谱相似，而阔叶木的FTIR谱明显不同。阔叶木和针叶木都产生了水和酒精，而在220°C的热处理过程中分解的阔叶木中可以看到这些气体产物的含量。在阔叶木和针叶木中都发现了酮、醚、酸和芳香族化合物，而二氧化碳只在经过热处理的阔叶木中发现。
Wood thermal modification is an environmentally friendly method used to improve wood characteristics, and its degradation mechanism directly influences its application in construction, building, and home decoration. Combined thermogravimetry and Fourier transform infrared (TG–FTIR) studies were conducted to evaluate the hardwood and softwood on-site at 160 °C and 220 °C. The results indicated that the mass loss rates (MLRs) for both hardwood and softwood samples decreased over time and ultimately became constant. The total mass loss increased with an increase in temperature. The total mass loss was about 3% at 160 °C, and about 4.7% to 6.5% at 220 °C. Decomposition also occurred much more easily in the hardwood than in the softwood. More species of gas products were emitted from hardwood than softwood, and the number of species of gas products increased with an increase in temperature and processing time. The FTIR spectra of softwood were similar, whereas those of hardwood were remarkably different at different temperatures. Water and alcohol were generated from both the hardwood and softwood, whereas contents of these gaseous products were visible in hardwood decomposed at 220 °C during the thermal treatment. Ketones, ethers, acids, and aromatics were found in both hardwood and softwood, whereas CO2 was only found in the hardwood that underwent thermal treatment.