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Films of polypropylene (PP) were grafted with glycidil methacrylate (GMA) using supercritical CO 2 as swelling agent and solvent. Different pressures and temperatures were used to study their effects on the soaking and grafting process. FTIR results showed signals at 1726 and 1640 cm -1 , assigned to C=O and C=C (after the soaking process), and a decreased signal at 1640 cm -1 (after the grafting procedure), suggesting the effective grafting of GMA. For the grafted material immersed indoi:10.1590/s0104-66322006000200015 fatcat:xuvcemlaqrg2rm64a2yw6hhpoq