PHOTOGRAFTING OF HSS ON THE SURFACE OF LDPE FILM BY TWO STEPS

In order to get the surface of polymer materials acidified effectively, the introduction of strong acid group (sulfonic group) to the surface of LDPE film by photografting polymerization in two steps was investigated. Influences of parameters such as reaction time, monomer concentration, pH value in solution and grafting times on polymerization were examined. The obtained results indicate that prolonging photo reduction time and graft reaction time, increasing monomer concentration and pH value in solution, and grafting for more than once help to the improvement of graft extent. The grafted film was characterized by gravimetric method, water contact angle measurement, infrared spectrum analysis and scanning electron microscope observation.