The corona discharge technique was explored as a means of forming chemically active sites onto the BOPP film surface, the active species thus prepared at atmospheric pressure in air was exploited to induce subsequently copolymerization of acrylic amide (AAM) onto BOPP film in aqueous solution. The surface structure and the hydrophilic property of the grafted BOPP film were studied through FT-IR, ESCA and contact angle measurement. The results show that with corona discharge and copolymerization time, the grafting degree of AAM onto BOPP film increases. The grafting degree could reach a pretty high value of 2.06% by weight under the conditions of corona discharge 10 min and copolymerization reaction time 1h in 20% AAM aqueous solution at 70℃. The contact angle of the grafted BOPP film with water is much lower, and the hydrophilic property can be improved quite a lot as compared with that of ungrafted BOPP film.

Key words: SURFACE STRUCTURE, HYDROPHILICITY, PROPENAMIDE, POLYPROPYLENE, BIAXIALLY ORIENTED FILMS, GRAFT COPOLUMERIZATION