1964
DOI: 10.1002/pol.1964.100020830
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Efficiency and frequency of grafting of methyl methacrylate to granular corn starch

Abstract: PMMA 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. Th… Show more

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Cited by 33 publications
(18 citation statements)
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“…Unmodified corn starch was pretreated by the procedure of Brockway (13). Corn starch samples were successively extracted six times with refluxing 4 : 1 methanol-water to be defatted and then distilled water was used to wash the starch five times at room temperature (20 • C) to remove methanol.…”
Section: Methodsmentioning
confidence: 99%
“…Unmodified corn starch was pretreated by the procedure of Brockway (13). Corn starch samples were successively extracted six times with refluxing 4 : 1 methanol-water to be defatted and then distilled water was used to wash the starch five times at room temperature (20 • C) to remove methanol.…”
Section: Methodsmentioning
confidence: 99%
“…of reflux in 1 N HC1 (l), but not after 6 hr. (2). A more significant factor, however, especially with respect to the gradual dissolving of the PVAc itself in refluxing HC1, is the probability that the product of Walrath et al was crosslinked.…”
Section: Determination Of Total Pvac Contentmentioning
confidence: 99%
“…The graft reactions of methyl methacrylate, acrylonitrile, ethyl acrylate, acrylamide or acrylic acid onto corn starch in the presence of ceric or manganese ions were carried out at temperatures below 60 8 C; the values of conversion and efficiency in the reactions using well swollen corn starch or a hydrophobic monomer like methyl methacrylate were high, whereas those in the reactions using poorly swollen corn starch or hydrophilic monomers like acrylamide and acrylic acid were relatively low [15][16][17][18][19][20][21][22][23][24][25][26][27] . In the grafting reaction of AA onto corn starch, inhomogeneous products with low grafting efficiency were obtained by using Fenton's reagent (a mixture of hydrogen peroxide and ferric ions in water) as an initiator at temperatures below 40 8 C 15,18,19) . Similar products were obtained by using ammonium ceric sulfate/nitrate or manganic pyrophosphate as the initiator [20][21][22][23][24] .…”
Section: Introductionmentioning
confidence: 99%