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Many properties of cellulose depend on its chain length or degree of polymerization, the number of glucose units that make up one polymer molecule. Cellulose from wood pulp has typical chain lengths between 300 and 1700 units; cotton and other plant fibers as well as bacterial cellulose have chain lengths ranging from 800 to 10,000 units. [6]
These polysaccharides are also made from multiple subunits of glucose. The difference between cellulose and other complex carbohydrate molecules is how the glucose molecules are linked together. In addition, cellulose is a straight chain polymer, and each cellulose molecule is long and rod-like. This differs from starch, which is a coiled molecule.
Once the cellulose chain is bound, it is strung through a tunnel-shaped active site where the cellulose is broken down into two-sugar segments called cellobiose. [6] [7] The structure of the enzyme can be seen in the first figure. The second figure shows the activity of the enzyme, and shows both cellulose binding to the enzyme, as well as the ...
Printable version; Page information; ... nominally 385 × 178 pixels, file size: 20 KB) ... Structure of cellulose (chain conformation) Date: 21 October 2007:
Wet strength chemicals improve the tensile properties of the paper both in wet and dry state by crosslinking the cellulose fibres with covalent bonds that do not break upon wetting. Wet strength development should not be confused with sizing , the first representing the strength of the paper once wet, the latter being the speed and amount of ...
Cellulose acetate film, made from cellulose diacetate and later cellulose triacetate, was introduced in 1934 as a replacement for the cellulose nitrate film stock that had previously been standard. When exposed to heat or moisture, acids in the film base begin to deteriorate to an unusable state, releasing acetic acid with a characteristic ...
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The first step is transforming raw cellulose into nitrocellulose by conducting a nitration reaction. This is achieved by exposing the cellulose fibers to an aqueous solution of nitric acid; the hydroxyl groups (-OH) will then be replaced with nitrate groups (-ONO 2) on the cellulose chain. The reaction can produce mixed products, depending on ...