acrylonitrile

/ˌækrəloʊˈnaɪtraɪl/
/ˌækrəloʊˈnaɪtrɪl/

noun

A pungent, toxic liquid, used in making artificial fibers and other polymers.

Further research led to the development of a fiber Vinyon N, which is a copolymer of vinyl chloride with acrylonitrile.