中文摘要：

连续用0.5%、2.0%和5.0%Na OH水溶液在80℃条件下从巨龙竹中抽提得到木质素组分,采用凝胶色谱、红外光谱、核磁共振、热重分析仪表征了竹材木质素的化学结构和热稳定性。结果表明,巨龙竹木质素属于典型的禾草类木质素,其大分子由对羟基苯丙烷（H）、愈创木基丙烷（G）和紫丁香基丙烷（S）3种基本结构单元组成;巨龙竹木质素大分子的主要联接键为β-O-4＇醚键、β-β＇和β-5＇碳-碳键;巨龙竹木质素大分子苯丙烷结构单元侧链γ位碳与对香豆酸和阿魏酸存在化学键联接,形成对香豆酸酯和阿魏酸酯（醚）;巨龙竹木质素具有较高的热稳定性,其热稳定性随分子量增加而升高。

英文摘要：

Bamboo lignin polymer was isolated from Dendrocalamus sinicus with 0. 5%,2. 0%,and 5. 0% Na OH at 80℃,and its physicochemical properties were characterized with gel permeation chromatography（ GPC）,Fourier transform infrared spectroscopy（ FTIR）,nuclear magnetic resonance spectrum（ NMR）,and thermo gravimetric analysis（ TGA）. The results indicated that the bamboo lignin belongs to grass lignin,consisting of syringl（ S）,guaiacyl（ G）,and p-hydroxylphengl（ H） units. The major interunit linkages presented in the obtained bamboo lignin were β-O-4＇ aryl ether linkages,β-β＇ and β-5＇ C-C linkages. A small percentage of the lignin side-chain was found to be esterfied by p-coumaric acid and fumalic acid,and was etherified by fumalic acid at the γ-carbon. In addition,the thermal stability of bamboo lignin increased with increasing molecule weight.