Oxidative polymerization of acrylamide in the presence of thioglycolic acid |
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Authors: | Cemal Özero?lu Sacide Erdo?an |
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Institution: | (1) Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey |
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Abstract: | Chemical polymerization of acrylamide at room temperature was examined by using thioglycolic acid-cerium (IV) sulfate and
thioglycolic acid-KMnO4 redox systems in acid aqueous medium. Water soluble polyacrylamides containing thioglycolic acid end groups were synthesized.
The effects of the molar ratio of acrylamide to Ce(IV) n
AAm
/n
Ce(IV)
, the polymerization time, the temperature, the monomer concentration, the molar ratio of cerium (IV) sulfate to thioglycolic
acid and the concentration of sulfuric acid on the yield and molecular weight of polymer were investigated. Lower molar ratios
of acrylamide/Ce(IV) at constant monomer concentration resulted in an increase in the yield but a decrease in molecular weight
of polymer. The increase of reaction temperature from 20 to 70°C resulted in a decrease in the yield but generally resulted
in a constant value for the molecular weight of polymer. With increasing polymerization time, the yield and molecular weight
of polymer did not change substantially. Ce(IV) and Mn(VII) ions are reduced to Ce(III) and Mn(II) ions respectively in the
polymerization reaction. The existence of Ce(III) ion bound to polymer was investigated by UV-visible spectrophotometry and
fluoresce measurements. The amount of Mn(II) incorporated into the polymer was determined using graphite furnace atomic absorption
spectrometry. The mechanism of this phenomenon is discussed. |
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Keywords: | thioglycolic acid cerium (IV) sulfate redox polymerization acrylamide |
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