Hydrogels from acrylic acid with n,n-dimethylacrylamide: Synthesis, characterization, and water absorption properties

• S. AMALIA POOLEY ^[1] ; BERNABÉ L RIVAS ^[1] ; FELIPE E LILLO ^[1] ; GUADALUPE DEL C PIZARRO ^[2]
  1. [1] Concepcion University Faculty of Chemistry Polymer Department
  2. [2] Technological Metropolitan University Department of Chemistry
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 55, Nº. 1, 2010, págs. 19-24
• Idioma: inglés
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• Resumen

  • Copolymer hydrogels of acrylic acid (AA) with N,N-dimethylacrylamide (NNDMAAm) were synthesized by solution free radical polymerization at different feed mol monomer ratios. The monomer reactivity ratios were determined by Kelen-Tüdös method. According to that, the monomer reactivity ratios for poly(AA-co-NNDMAAm) were r1 = 0.650 (M1=AA) and r2= 1.160 (M2=NNDMAAm), (r1 x r2= 0.753). The effect of reaction parameters including: the concentration of cross-linking reagent, monomer concentration, pH, temperature, salt solutions, and solvent polarity on the water absorption have been studied. The hydrogels achieved water-absorption values of 544 g water/ g xerogel for the copolymer poly(AA-co-NNDMAAm) 3:1 atpH 5. Low critieal solution temperature (LCST) values of hydrogels, showed an increase whenthe hydrophilic AA moiety eontent increased in the copolymers.