Studies on Kinetics of Ultrasonic Induced Microemulsion Polymerization of MMA

In this paper, the radical scavenger DPPH was used to study the kinetics of ultrasonic induced microemulsion polymerization of MMA. Rate constants and apparent activation energy were obtained under various temperatures and power outputs. Compared with the results of ultrasonic induced bulk polymerization of MMA, the rate constants in this study were much higher, indicating that there was higher initiation efficiency of ultrasonic irradiation in emulsion system than in pure monomers. The kinetics results of ultrasonic induced microemulsion polymerization were expected to be suitable for the ultrasonic induced emulsion polymerization for their similar initiation mechanism. The kinetics during the polymerization was also investigated, and the result proved that there was an extended region of constant rate when the concentration of radicals was lower. Therefore, the results of the study on the kinetics of ultrasonic induced microemulsion polymerization of MMA provided a theoretical foundation for deeply understanding the mechanism of ultrasonic induced microemulsion and emulsion polymerization.