Corona discharge was explored as a means of forming chenucally active sites on the surface of low density polyethylene (LDPE) film. The active specties thus prepared at atmospheric pressure in air was used to induce subsequent graft copolymerization of 2-hydroxylethyl methacrtylate (HEMA) on LDPE film in aqueous solution. The surface structure and blood - compatibility if the grafted LDPE film were studied through ATR-IR, SEM, contact angle with water, hemolysis and recalcification time measdurements. The results show that with reaction time and HEMA concentration in the reaction solution, the grafting degree of HEMA onto LDPE film increases. As reaction temperature increases, the prafting degree first to a mazimum, then decreases. As the grafting degree increases, the contact angle of HEMA -grafted LDPE film with water decreases. compared with ungrafted LDPE film, the hemolysis degree of HEMA-m grafted LDPE film decreases and the recalcification time increases. The blood comp[atibility of HEMA - grafted LDPE film is improved .

Key words: METHYLPROPENOIC ACID ESTER, POLYETHYLENE, THIN FILMS, CORONA DISCHARGE, INFRARED SPECTROPHOTOMETRY, SCANNING ELECTRON MICROSCOPES, GRAFT POLYMERIZATION