rayon is prepared by
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Rayon is a regenerated cellulose fiber that is made from natural sources of cellulose, such as wood and related agricultural products.[1] It has the same molecular structure as cellulose. Viscose can mean:[2]
A viscous solution of cellulose
A synonym of rayon
A specific term for viscose rayon — rayon made using the viscose process
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When a solution of cellulose in cuprammonium hydroxide comes into contact with sulfuric acid, the cellulose begins to precipitate from the solution. The sulfuric acid reacts with a complex compound of copper and dissolves it. Thin blue fibers of rayon are formed. After some time, sulfuric acid reacts with the complex compound and washes out the copper salts from the fibers. The fibers become colorless.
Many types and grades of viscose fibers and films exist. Some imitate the feel and texture of natural fibers such as silk, wool, cotton, and linen. The types that resemble silk are often called artificial silk. The fibre is used to make textiles for clothing and other purposes.[3]
Rayon production involves solubilizing cellulose. One popular method involves use of alkali and carbon sulfide.[4][5] Another method involves using ammoniacal solutions of copper salts. Yet another route, the lyocell process, relies on a special solvent.[6][7]
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