HYDROGELS FROM ACRYLIC ACID WITH N,N-DIMETHYLACRYLAMIDE: SYNTHESIS, CHARACTERIZATION, AND WATER ABSORPTION PROPERTIES

S. AMALIA POOLEY, BERNABÉ L RIVAS, FELIPE E LILLO, GUADALUPE DEL C PIZARRO
2010 Journal of the Chilean Chemical Society (Print)  
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(AAco-NNDMAAm) were r 1 = 0.650 (M 1 =AA) and r 2 = 1.160 (M 2 =NNDMAAm), (r 1 x r 2 = 0.753). The effect of reaction parameters including: the concentration of cross-linking reagent, monomer
more » ... ent, 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 at pH 5. Low critical solution temperature (LCST) values of hydrogels, showed an increase when the hydrophilic AA moiety content increased in the copolymers.
doi:10.4067/s0717-97072010000100006 fatcat:ogys3kd3gvf5rj6asxdojr4brq