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以木材液化物为原料制备了木素基前驱体,考察了其组分含量、热稳定性能、化学结构等性能,并纺制了初始纤维。结果表明:在水浴温度70℃、pH=7.0条件下制备的前驱体木素含量较其他工艺更高,为77.22%;灰分含量最低,为0.43%。热重分析表明其热解反应更为缓和,热解失重率为7.5%。红外光谱分析表明,前驱体中亚甲基键的相对数量随着温度的升高而增多,其内部分子交联程度得到增强。扫描电镜结果表明,该条件下制备的前驱体纺制的初始纤维表面较为光滑,孔隙及裂缝较少。
The lignin-based precursors were prepared from liquefied wood. The content of the lignin-based precursors, the content of the lignin, the thermal stability, the chemical structure and other properties were investigated. The initial fibers were spun. The results showed that the content of precursor lignin was 77.22% higher than that of other processes at the temperature of 70 ℃ and pH = 7.0, and the lowest ash content was 0.43%. Thermogravimetric analysis showed that the pyrolysis reaction was more moderate, and the weight loss rate of pyrolysis was 7.5%. Infrared spectroscopy analysis showed that the relative amount of methylene bond in the precursor increased with the increase of temperature and the degree of cross-linking of its internal molecules was enhanced. Scanning electron microscopy results show that the precursors prepared under the conditions of the initial spinning fiber surface is relatively smooth, less pores and cracks.