Inversion emulsion polymerization of sodium 2-acrylamido-2-methylpropanesulfonate

The kinetic laws of polymerization of sodium 2-acrylamido-2-methylpropanesu lfonate carried out at pH 9 and 60 degrees C in the inverse water-heptane e mulsions in the presence of emulsifier (sorbitan C) and water-soluble initi ating system (potassium persulfate-sodium bisulfite) were studied by dilato metry. It was shown that the kinetics of the process under study is similar to the kinetics of solution polymerization. It was demonstrated that the i nitial rate of polymerization and the molecular mass of the polymer change in a cymbate manner with an increase in the emulsifier concentration. The k inetic curves show maxima when the emulsifier concentration in heptane achi eves 4%. The said parameters increase with the increasing monomer concentra tion and temperature, while an increase in the initiator concentration caus es these parameters to change in opposite directions.