Graft copolymerization of 2-acrylamido-2-methyl-1-propanesulfonic acid onto carboxymethylcellulose (sodium salt) by H2O2/Fe+2 redox pair

The effect of the reaction conditions on the grafting parameters during grafting of 2-acrylamido-2-methyl-1-propanesulfonic acid onto sodium carboxymethylcellulose using H2O2/Fe+2 redox pair are studied at 30 degrees C. The grafting ratio, add on, and conversion initially increase with the H2O2 concentration in the range of (10.0-15.0) X 10(-2) mol dm(-3). Thereafter, these parameters decrease with the H2O2 concentration. The grafting ratio, add on, and conversion increase when increasing the ferrous ion concentration from (0.5 to 4.0) X 10(-2) mol dm(-3) and decrease with a further increase in the concentration. It is observed that the grafting ratio and add on increase with the monomer concentration, whereas the conversion decrease. The hydrogen ions seem to be facilitating the grafting reaction up to a certain concentration and after this concentration seem to be retarding the process. The grafting ratio, add on, and conversion decrease with the sodium carboxymethylcellulose concentration. When increasing the time period from 60 to 90 min, the grafting parameters increase but decrease thereafter. Similarly, when increasing the temperature from 25 to 30 degrees C, the grafting parameters increase and decrease thereafter. (c) 2006 Wiley Periodicals, Inc.