Synthesis and Characterization of Alginate-g-vinyl Sulfonic Acid with a Potassium Peroxydiphosphate/ Thiourea System

Alginate-g-vinyl sulfonic acid graft copoly- mer was synthesized through the graft copolymerization of vinyl sulfonic acid (VSA) onto alginate with an efficient sys- tem, i.e., potassium peroxydiphosphate (PDP)/thiourea in an aqueous medium. The effects of the concentration of thiou- rea, PDP, hydrogen ion, alginate, and VSA along with the time and temperature on the graft copolymerization were studied by the determination of the grafting parameters (grafting ratio, add-on, conversion, grafting efficiency, and homopolymer). The synthesized graft copolymer was charac- terized by FTIR analysis. Thermogravimetric analysis showed that the alginate-g-vinyl sulfonic acid is thermally more stable than alginate. Water swelling capacity, metal ion sorption, flocculation, and resistance to biodegradability studies of syn- thesized graft copolymer have been performed with respect

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