Читать книгу Adhesives for Wood and Lignocellulosic Materials - R. N. Kumar - Страница 20

Wood is made up of cell wall constituents and extraneous materials (Figure 1.3). The cell wall constituents, namely, polysaccharides and lignin, are collectively called wood substance, which typically accounts for 95–98% of the weight of the wood, the remainder being extraneous organic and inorganic materials. The ratio of polysaccharides to lignin in the wood substance is roughly 3:1. The most abundant polysaccharide, cellulose, in the form of microfibrils, provides the structural framework for all plant tissues. Pettersen [17] provides an extensive compilation of the chemical composition of woods from the entire world.

Figure 1.3 Chemical composition of wood.