This work presents a study of superficial properties of polyacrylonitrile (PAN) films obtained by extrusion process. This innovative material was submitted to microwave plasma treatment generated at low pressure. The contact angle was measured with and without treatment in nitrogen and argon plasma, by the pendant drop technique. The work of adhesion was calculated by the Young-Dupre equation. The surface energy was calculated by the harmonic and geometric average methods, through the technique of two liquids proposed by Fowkes and Wu. The results showed an increase on the surface wetting, for films of plasma treat under nitrogen and argon, which indicated a modification in the surface of the PAN polymeric film.