Surface graft copolymerizaion of acrylic amide onto BOPP film through corona discharge

The corona discharge technique was explored as a means of forming chemicall y active sites onto the BOPP film surface, the active species thus prepared at atmospheric pressure in air was exploited to induce subsequently copoly merization of acrylic amide (AAM) onto BOPP film in aqueous solution. The s urface structure and the hydrophilic property of the grafted BOPP film were studied through FT - IR, ESCA and contact angle measurement. The results s how that with corona discharge and copolymerizaion time, the grafting degre e 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 1 h in 20% AAM aqueous solution at 7 0 degrees C. 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.