Graft polymerization of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid onto starch
1979
Fanta, G.F. | Burr, R.C. | Doane, W.M.
In the reported experiments, mixtures of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid (AASO//3H) were graft polymerized onto starch by cobalt-60 irradiation, and the water absorbency and water solubility of the resulting products were determined. Products with high water absorbency were obtained with equal weights of starch and total monomers when acrylamide:AASO//3H ratios ranged from 9:1 to 1:3. Neutralization of AASO//3H with sodium hydroxide before graft polymerization drastically reduced both the water solubility and absorbency of the final products. A reaction with granular starch was also carried out under simultaneous irradiation with a total monomer:starch ratio of 2:5 and with equal weights of the two monomers. Conversion of monomers to polymer was once again nearly quantitative. Graft copolymers with good water absorbency were also obtained by adding preirradiated starch to a water solution of acrylamide and AASO//3H, although only partial conversions of monomers to polymer were realized. The M//n of some of the synthetic polymers was also determined after removal of carbohydrate by enzymatic hydrolysis.
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