Nytril fibers

Nytril fiber n. A manufactured fiber containing at least 85% by weight of a long chain polymer of vinylidene dinitrile [-CH2-C (CN)2-] and having the vinylidene dinitrile group in no less than every other unit in the polymer chain (FTC definition). Nytril fibers have a low softening point so they are most commonly used in articles that do not require pressing such as sweaters and pile fabrics. They are also blended with wool to improve shrink resistance and shape retention. 

Nytril Fiber n A manufactured fiber containing at least 85% by weight of a long chain polymer of vinylidene... 

Nytril fibers are made up of polymers containing at least 85% vinyli-dene dinitrile units, which appear at least every other unit in the polymer chain. The comonomer used in Nytril synthesis is vinyl acetate. The two monomers are polymerized in benzene using peroxide catalyst. The polymer is precipitated, washed, and dissolved in ], ] -dimethyl formamide and then passed through a spinneret into an aqueous coagulating bath to form Nytril fibers. The properties of the Nytril fiber are similar to the other acrylic fibers. The fiber possesses moderate tensile, regain, and thermal properties. The fiber is chemical and sunlight resistant but is as flammable as cellulosic fibers. Darvan Nytril fibers were produced in the U.S. until 1961. 

The more crystal-like the polymer structure, the more dramatic is the difference. Note, however, that some fibers, such as the nytrils and triacetates, have small or no detectable difference related to orientation, a valuable observation for classification. 

---