Methyl methacrylate (MMA) was efficiently graft-copolymerized in aq. FeCl
3 solution onto cellulose by the UV irradiation from a high-pressure mercury lamp. While the oxygen removal from the system by means of vigorous evacuation caused the drastic decrease of percent grafting. In this connection PMMA chains prepared in FeCl
3-saccharide systems by the UV irradiation were found to scarcely contain saccharide residues at the chain ends, irrespective of the species of the saccharides used. The formation of both Fe
2+ and hydrogen peroxide as a result of the irradiation on the reaction systems was confirmed by conducting model reactions. It was suggested from these results that the homopolymerization is initiated with free radicals resulted from the redox reaction between Fe
2+ and H
2O
2, and followed by the grafting via the transfer reaction of the growing homopolymer radicals to cellulose molecules.
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