Abstract
AbstractPMMA content of graft copolymers with granular starch can be determined by acid hydrolysis with sufficient precision to allow reasonable estimates of efficiency and frequency of grafting. Preparation of the graft copolymer by initiation of methyl methacrylate with hydrogen peroxide and activators results in products containing long PMMA side chains attached to the starch at very infrequent intervals, but the length and frequency of attachment can be varied considerably by changes in the ratios of reactants. The highest frequency achieved was with PMMA of number‐average molecular weight of about 30,000, attached at a frequency of one chain per 230–250 glucose units in the starch. Under the more favorable conditions, oxidized starch yielded product of significantly more frequent grafting than did unmodified starch. Gradual addition of monomer, initiator, and activator to the starch slurry gave slightly higher frequency of grafting than did complete addition of all reactants at the start of the polymerization.
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