Abstract
Microcapsule with polyurea shell was prepared from oil-in-water (O/W) emulsion under various agitation speeds (230, 500, and 700 rpm) to encapsulate cumene hydroperoxide (CHP) and tert-butyl peroxy-2-ethyl hexanoate (TBPEH). Thus prepared microcapsule size and shell contents were observed to be decreased as the agitation speed increased. Differential scanning calorimetry (DSC) was used to measure and compare the effect on the reaction kinetics of the methyl methacrylate (MMA) radical polymerization in the presence of various initiators. When encapsulated initiator was used instead of unencapsulated initiator the maximum conversion and maximum reaction rate were decreased and the reaction temperature was delayed. The delay in reaction temperature was lager as the agitation speed decreased. In the case of encapsulated CHP at 230, 500, 700 rpm, the temperature at the maximum reaction rate was delayed by 5.8, 3.0, and 0.4 °C, respectively, compared to unencapsulated CHP.
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Acknowledgment: This work was supported by research fund of Chungnam National University.
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Kwon, H.J., Lee, E.J., Kim, M.R. et al. Encapsulation of Peroxide Initiator in a Polyurea Shell: Its Characteristics and Effect on MMA Polymerization Kinetics. Macromol. Res. 27, 198–204 (2019). https://doi.org/10.1007/s13233-019-7094-4
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DOI: https://doi.org/10.1007/s13233-019-7094-4