Ultrahigh molecular weight copolymers of acrylonitrile (AN) with sodium salt of trans-3-(4-sulfo-phenylcarbamoil)-acrylic acid (S) were obtained by plasma-induced polymerization (PIP) in water solutions. The copolymerization parameters were established and some structural and physical characterizations by thermally stimulated depolarization currents (TSDC) spectroscopic analysis of the S-AN copolymer were performed.