The cellulose thiocarbonate, in the fabric form, was treated first with a freshly prepared ferrous ammonium sulphate (FAS) solution. The so-treated fabric formed, with N-bromosuccinimide (NBS), an effective redox system capable of initiating grafting of methyl methacrylate (MMA) and other vinyl monomers onto the cotton fabric. The effect of the polymerization conditions on the polymer criteria, namely, graft yield, homopolymer, total conversion, and grafting efficiency, was studied. These polymer criteria were found to depend extensively upon concentrations of the Fez+ ion (activator), NBS (initiator), and MMA; pH of the polymerization medium, and duration and temperature of polymerization. Based on detailed investigation of these factors, the optimal conditions for grafting were as follows: Fez+, 1 X mol/L; NBS, 1 X lo-' mol/L; MMA, 4%; pH, 2; polymerization time, 150 min; polymerization temperature, 6OoC; material/liquor ratio, 1 : 100. Under these optimal conditions, the rates of grafting of different vinyl monomers were in the following sequence: methyl methacrylate % methyl acrylate > acrylonitrile. Other vinyl monomers, namely, acrylic acid, and methacrylic acid have no ability to be grafted to the cellulosic fabric using the said redox system. A tentative mechanism for the polymerization reaction is suggested.