中文摘要：

以草本类植物中的稻草和毛竹为原料，采用酶解／温和酸解法来分离草本类木素，制得酶解／温和酸解木素（EMAL）．运用元素分析、傅里叶变换红外光谱（FT—IR）和核磁共振定量磷谱（31P—NMR）等手段对两种EMAL的化学结构和性能进行表征，同时利用热重一傅里叶红外光谱联用（TG—FFIR）和热解一气相色影质谱联用（Py-GC／MS）技术研究EMAL的热裂解特性．发现：稻草的聚戊糖和抽出物含量较高，而毛竹的纤维素和木素含量较高；稻草EMAL含有丰富的愈创木基（G型）结构单元，毛竹EMAL主要以紫丁香基（S型）结构单元为主；毛竹EMAL在384℃出现一个明显的失重峰，而稻草EMAL热解时分别在270和384℃出现明显失重峰；两种木素化学结构的差异会影响EMAL的热解性质和热解产物．

英文摘要：

Two representative herbaceous plants, namely, rice straw and bamboo, were selected as the materials to produce two kinds of enzymatic/mild acidolysis lignin （EMAL） by isolating lignin via an enzymatic/mild acidolysis process. Then, the chemical structure and properties of the products were characterized by means of elemental analysis, FT-IR and quantitative 31p-NMR, and the pyrolysis characteristics of the products were investigated by means of TG-FTIR and Py-GC/MS. The results show that （ 1 ） rice straw contains more pentosan and extractives while bamboo contains more cellulose and lignin; （2） guaiacyl units （G type） are abundant in rice straw EMAL while bamboo EMAL possesses more syringyl units （S type） ; （3） during the thermal degradation, there is one distinct weight loss peak at 384℃ in bamboo EMAL but two at 270℃ and 384℃ in rice straw EMAL;and （4） the difference in chemical structure greatly affects thermal decomposition behaviors as well as pyrolysis products of EMAL.