Increases in surfactant concentration correspond to: (1) an increase in generated free radical concentration and (2) a decrease in polymer molecular weight. The generated free radical concentration, the number of polymer particles produced, and the polymerization rate exhibit an increasing trend with an increasing (1) acoustic intensity, (2) argon gas flow rate, and (3) surfactant concentration. It was found that the extent of free radical generation increased as: (1) the 0.60 power of the acoustic intensity, (2) the 0.44 power of the argon gas flow rate, (3a) the 0.35 power of the surfactant concentration within the 0.035 M–0.139 M surfactant concentration range, and (3b) the 1.09 power of the surfactant concentration within the 0.139 M–0.243 M surfactant concentration range. The sodium lauryl sulfate molecule degraded under ultrasound to form free radicals in the water. In these radical trapping experiments, aqueous solutions of sodium lauryl sulfate were ultrasonically irradiated in the presence of a radical scavenger. ![]() In this study, radical trapping experiments were used to investigate the effect of acoustic intensity, argon gas flow rate, and sodium lauryl sulfate concentration on the extent of free radical generation in aqueous sodium dodecyl sulfate solutions. In the previous work, we have studied the effects of acoustic intensity, argon gas flow rate, surfactant concentration, and initial monomer concentration on polymerization rate, polymer particle number, and polymer molecular weight in the ultrasonically initiated emulsion polymerization of methyl methacrylate.
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