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yes , it is a polyacrylonitrile.
It has the repeating unit C3H3N according to this website:
http://www.polymerprocessing.com/polymers/PAN.html
Polyacrylonitrile, Acrylonitrile butadiene styrene
polyacrylonitrile
Frequently used are polyacrylamide/polyacrylate copolymers, polyethylene oxide, polyacrylonitrile etc.