木材的主要成份是构成木材细胞壁和胞间层的纤维素、半纤维素和木素。迄今认为,由纤维素分子构成的纤维素,其构造是由原纤或微纤成层次地盘绕而成,其周围有半纤维素、木素和水等物质。经X射线研究,纤维素是由结晶区和无定形区联接而成的二相体系,在结晶区内,纤维素分子的排列具有完全的规则性,呈现清晰的X射线衍射图,其结晶结构属于单斜晶系,结构区间为无定形区,但结晶区和无定形区无明显 The main ingredients of wood are the cellulose, hemicellulose and lignin that make up the wood cell wall and intercellular layer. Hitherto it has been assumed that cellulose composed of cellulose molecules is constructed by layering fibrils or microfibers in layers surrounded by materials such as hemicellulose, lignin and water. X-ray studies show that cellulose is a two-phase system composed of crystalline and amorphous regions. In the crystalline region, the arrangement of cellulose molecules is completely regular and shows a clear X-ray diffraction pattern. The crystalline structure Belonging to the monoclinic system, the structural interval is amorphous, but the crystallization zone and amorphous zone are not obvious