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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, monomerdoi:10.4067/s0717-97072010000100006 fatcat:ogys3kd3gvf5rj6asxdojr4brq