Poly(methyl acrylate) has been graft copolymerized onto a soluble protein, gelatin, in aqueous medium by using eerie amnionic nitrate (CAN) as the redox initiator. Graft copolymerization was carried out at 35, 45, and 55°C for various reaction periods. Maximum percent grafting occurred at 45°C. Nitric acid was found to influence grafting. Percent grafting has been determined as a function of (1) concentration of CAN, monomer, and nitric acid; (2) time; and (3) temperature.