Characterization of liquefied wood residues from different liquefaction conditions
Characterization of liquefied wood residues from different liquefaction conditions
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DOI：
10.1002/app.26435
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发表时间：
2007-09
影响因子：
3
通讯作者：
H. Pan;T. Shupe;C. Hse
中科院分区：
文献类型：
--
作者：
H. Pan;T. Shupe;C. Hse
木材残余物的量被用作木材液化程度的量度。木材液化残留物的表征为理解液化反应的一些基本方面提供了新的途径。通过湿化学分析、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）对残留物进行了表征。随着酚木比（P/W）的增加，残渣中Klason木质素含量降低，综纤维素和α-纤维素含量增加。在密封反应系统下液化木材残留物的FTIR光谱中，1735 cm−1处的峰（归因于木聚糖中的酯羰基）消失，表明大气液化与密封液化的效果显著不同。残余物的结晶度指数高于未处理的木材颗粒的结晶度指数，并随着P/W比的增加而略有增加。残体的SEM图像显示，随着P/W比从1/1增加到3/1，纤维束逐渐减小为小束甚至单纤维，表明液化过程中中间层的木质素先于纤维素溶解。© 2007 Wiley Periodicals，Inc.应用聚合物科学杂志，2007年
The amount of wood residue is used as a measurement of the extent of wood liquefaction. Characterization of the residue from wood liquefaction provides a new approach to understand some fundamental aspects of the liquefaction reaction. Residues were characterized by wet chemical analyses, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The Klason lignin content of the residues decreased, while the holocellulose and α-cellulose contents increased as the phenol to wood ratio (P/W) increased. A peak at 1735 cm−1, which was attributed to the ester carbonyl group in xylan, disappeared in the FTIR spectra of the residues from liquefied wood under a sealed reaction system, indicating significantly different effects of atmospheric versus sealed liquefaction. The crystallinity index of the residues was higher than that of the untreated wood particles and slightly increased with an increase in the P/W ratio. The SEM images of the residues showed that the fiber bundles were reduced to small-sized bundles or even single fibers as the P/W ratio increased from 1/1 to 3/1, which indicated that the lignin in the middle lamella had been dissolved prior to the cellulose during liquefaction. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007