【摘要】 采用化学分析方法和FF-IR、GPC、¹H-NMR等测试技术对粉单竹（Lingnania chungii McClure）及其APMP的磨木木素进行了研究。结果表明,粉单竹木素为GSH型,并且含有较多的缩合G型单元,示性式为C₉H_9.80O_3.44（OCH₃）_1.33,β-O-4结构是木素的主要连接方式,另外还含有部分β-β结构和共轭酯键连接。在APMP制浆过程中,木素结构的H型和非缩合G型单元容易溶出,缩合G型和S型单元得到保留,甲氧基含量增加,酚羟基和醇羟基含量下降,β-O-4连接相对含量增加,β-β和共轭酯键连接减少,制浆后木素的分子结构受到较大程度的碎解。邻酚、邻醌类结构是竹材木素的主要发色基团,制浆后醌类结构含量有很大增加。更多还原

【Abstract】 Milled wood lignins isolated from white powdery bamboo （Lingnania chungii McClure） and its APMP pulp were characterized u- sing alkaline nitrobenzene oxidation,elemental analysis,molecular weight analysis and FTIR,¹H NMR spectroscopy.The results showed that the lignin is composed of large amount of syringyl （S） and guaiacyl （G） units together with a few p-hydroxyphenyl （H） units.The C₉ formulas for bamboo raw material and its APMP lignins are C₉H_9.80O_3.44（OCH₃）_1.33 and C₉H_9.12O_3.06（OCH₃）_1.58 respectively.The average molecular weight of APMP lignin decreases largely because of serious degradation of the original bamboo lignin during APMP pulping.Com- pared with original bamboo lignin,the contents ofβ-O-4 ether structure and methoxyl group in the lignin of the pulp increase as the H and non-condensed G units are dissolved easier than S and condensed G units during APMP pulping.Furthermore,the contents of aliphatic and phenolic hydroxyl groups are reduced.It is also concluded that the orth-phenol and orth-quinone structures are major contributor to the color of the bamboo lignin.The increase of ortho-quinone structures in the lignin of the pulp must be an obstacle to further improve the pulp bright- ness.更多还原