The Swelling Behaviors of poly(2-acrylamido-2-methyl-1-propane sulfonic acid co-1-vinyl-2-pyrrolidone) Hydrogels

S. Çavuş, E. Çakal Department of Chemical Engineering, Faculty of Engineering, Istanbul University-Cerrahpaşa, Avcilar, 34320 Istanbul, Turkey

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In this study, poly(2-acrylamido-2-methyl-1-propane sulfonic acid-co-1-vinyl-2-pyrrolidone), P(AMPS-co-VP), hydrogels were prepared by free radical cross-linking polymerization method in deionized water at 60° for 24 hours with different molar percentages of AMPS and VP. In the preparation of hydrogels, ammonium persulphate (APS), N,N'-methylenebisacrylamide (NMBA) and N,N,N',N'-tetramethylethylenediamine (TEMED) were used as initiator, cross-linking agent and accelerator, respectively. NMBA was used in amounts of 5, 6 and 8% with respect to total monomer concentration in the feed. The equilibrium swelling value (ESV) of P(AMPS-co-VP) hydrogels was determined in deionized water and in buffers with different pH values. ESV of P(AMPS-co-VP) hydrogels prepared with 5% NMBA is higher than that of the counterparts with 6 and 8%. Swelling behavior of hydrogels was strongly dependent on AMPS content and ESV decreased with increase in AMPS amount. An evident pH-sensitivity was not observed for the P(AMPS-co-VP) hydrogels. The characterization study was performed using Fourier transform infrared spectroscopy and thermogravimetric analysis.

DOI:10.12693/APhysPolA.134.129 topics: Hydrogels, sulfonic acid, 1-vinyl-2-pyrrolidone, swelling