The UV-induced grafting of glycidyl methacrylate (GMA) onto high-density polyethylene (HDPE) and the atomic force microscopy (AFM) study of the morphologic change of the grafted Surface are reported. The grafting was carried out in GMA acetone Solutions with different monomer concentrations. Grafting was much faster in a Solution with a higher monomer concentration. FTIR analyses proved that GMA had been successfully grafted onto HDPE. The morphologies of grafted HDPE Surfaces changed with UV irradiation time. The monomer concentration had a significant effect oil the morphologies of the grafted HDPE surfaces. The HDPE surface grafted in a solution with a higher monomer concentration was Much rougher than that grafted in a solution with a lower monomer concentration. The growth models of the grafted granules or clusters are also proposed. (C) 2009 Elsevier Inc. All rights reserved.