Abstract
AbstractA strong viscosity increase upon polymerization hinders cavitation and subsequent radical formation during an ultrasound‐induced bulk polymerization. Ultrasound‐induced radical polymerizations of methyl methacrylate (MMA) have been performed in CO2‐expanded MMA, as well as in bulk MMA. For this purpose, the phase behavior of CO2/MMA systems has been determined. With temperature oscillation calorimetry, the influence of CO2 on the viscosity and on the reaction kinetics of ultrasound‐induced polymerizations of MMA has been studied. In contrast to polymerizations in bulk, this technique shows that a low viscosity is maintained during polymerization reactions in CO2‐expanded MMA. As a consequence, a constant or even increasing polymerization rate is observed when pressurized CO2 is applied. © 2005 American Institute of Chemical Engineers AIChE J, 2005
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