pyroxylin

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pyroxylin

(pīrŏk`sĭlĭn), partially nitrated cellulose (see nitrocellulosenitrocellulose,
nitric acid ester of cellulose (a glucose polymer). It is usually formed by the action of a mixture of nitric and sulfuric acids on purified cotton or wood pulp.
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). It is used in lacquers, plastics, and artificial leathers. Pyroxylin lacquers are made by dissolving pyroxylin in a mixture of volatile solvents and adding a plasticizer and a pigment or dye. Pyroxylin plastics are made by colloiding pyroxylin with large amounts of a plasticizer such as camphor; such plastics (e.g., celluloid) are highly flammable. Collodioncollodion
, solution of pyroxylin in a mixture of alcohol and ether. Upon exposure to air, the solvents evaporate, leaving a thin, colorless, elastic film on any surface upon which the collodion has been spread.
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 is a solution of pyroxylin in ether and ethanol.

Pyroxylin

 

a nitrate ester of cellulose. Pyroxylins nos. 1 and 2, which differ in nitrogen content, are used commercially.

pyroxylin

[pə′räk·sə·lən]
(organic chemistry)
[C12H16O6(NO3)4]x Any member of the group of commercially available nitrocelluloses that are used for properties other than their combustibility; the term is commonly used to identify products that are principally made from nitrocellulose, such as pyroxylin plastic or pyroxylin lacquer. Also known as collodion cotton; soluble guncotton; soluble nitrocellulose.