【摘要】 <正> 一、前言 木素是木材和其它植物原料的主要组成物质,是一种具有芳香族特性的、三度空间结构的、其基本结构单元是苯丙烷型的无定型高聚物,含量约为植物原料的1/3—1/5,是自然界最重要的可再生的有机资源之一,在能源匮乏,资源枯竭的当今世界,开展木素化学的研究是有着重要的现实意义的。而木素的热降解则是利用木素的最好的方法之一,倍受世界化学家的青睞;这是因为,现在从有限的石油资源中提取得到的芳香族更多还原

【Abstract】 Using dioxane lignin from Larix dahurica, prepared by traditional method, the mechanism of pyrolyzed lignin is studied through differential scanning calorimetry (DSC) and infrared (IR), It is found on the DSC thermogram that there are three exothermic peaks at temperature 340, 400 and 520℃. Tile first peak and its correspondent IR spectrum indicate that the C—O—C linkages between or within the monorneric phenylpropane of the macromolecular lignin are weakened and a small part of them decomposed. The second peak occurs at 400℃, which reveals that most of the C—O—C linkages and some of the C—C linkages are broken. The third one, occurs at 520℃, implies that the lignin molecules and their fragments are decomposed rapidly and carbonized gradually.更多还原