203
11
Lignin
Hemicellulose
Cellulose fibrils
Micelle
Macrofibril
Microfibril
Pit
Middle lamella
S econdary wall
Primary wall
. Fig. 11.1 Lignin as filler between cellulose fibrils in wood composites (© G. Tambour, Forstliche Fakultät, Göttingen,
© Copyright Clearance Center’s RightsLink® service)
. Table 11.1 Chemical composition of various plants (in % by weight)
a Fibrous residues of sugar manufacture from sugar cane (7 Sect. 6.3)
b Plant genus of sweet grasses, e.g. Chinese reed
Plant
Lignin
Cellulose
Hemicellulose
Ash
Spruce
29
43
24
>1
Beech
25
38
35
>1
Bagasse a
23
44
29
3
Wheat straw
17
40
31
7
Miscanthus b
20
43
21
3
11.2 · Structure of Lignin