Abstract
The degree of crystallinity, crystalline dimensions and defects were determined in native and isolated celluloses by X-ray analysis. The degree of crystallinity and the length of crystallites in native cellulose from grassy plants is less than in native cellulose from wood, flux and the cotton plant. The lateral crystallite dimensions of native cellulose from grassy plants and wood are 3.5–4.0 nm, from flax and cotton linters 5–7 nm. The separation of cellulose from the plant material by various delignification methods is accompanied by lateral cocrystallization of the crystallites leading to aggregation of elementary fibrils and loss of their individuality. Cellulose crystallites show low defectivity.
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