Preparation, characterization and investigation of adsorption properties of chemically crosslinked acrylamide/citraconic acid/sodium acrylate terpolymers

In this study, it was aimed that synthesis of chemically crosslinked terpolymers byusing acrylamide as monomers with citraconic acid and sodium acrylate,characterization and the investigation of adsorption properties of synthesizedpolymers. Chemically crosslinked acrylamide/citraconic acid/sodium acrylate andacrylamide/sodium acrylate/citraconic acid polymers were prepared by free radicalpolymerization in aqueous solution using ethylene glycol dimethacrylate and 1,4-butanediol dimethacrylate as crosslinkers. Ammonium persulphate as initiator andN,N,N',N'-tetramethylethylenediamine as accelerator were used in the reaction.Structural characterization of chemically crosslinked polymers was made withFourier Transform Infrared Spectroscopy (FT-IR) analysis. Dynamic swelling testswere applied to chemically crosslinked acrylamide/citraconic acid/sodium acrylateand acrylamide/sodium acrylate/citraconic acid polymers at 25oC for swellingcharacterization. Parameters about swelling kinetics and diffusion mechanism werecalculated by using of the results of swelling studies.Basic Blue 12 (BB 12) and uranium acetate (for uranyl ions) were selected as modelmolecules to investigate adsorption properties of chemically crosslinkedviacrylamide/citraconic acid/sodium acrylate and acrylamide/sodiumacrylate/citraconic acid polymers. Adsorption properties were investigated byinteracting of chemically crosslinked acrylamide/ citraconic acid/sodium acrylate andacrylamide/sodium acrylate/citraconic acid polymers samples with BB 12 anduranium acetate (for uranyl ions) until equilibrium at 25oC. At the end of theexperiments 21,70-78,91 % BB 12, and 18,46-40,72 % uranyl ions adsorptions weredetermined.KEY WORDS: acrylamide/citraconic acid/sodium acrylate, acrylamide/sodiumacrylate/citraconic acid, crosslinking, hydrogel, citraconic acid, sodium acrylate,swelling, adsorption.