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The resulting polymethyl methacrylate, insoluble in oil, forms a shell around the oil droplets. The resulting microcapsules are separated by filtration or centrifugation, washed and dried.
When encapsulating liquid substances by polycondensation, one of the monomers is dissolved in the phase of the encapsulated substance. To obtain microcapsules by polymerization, a drug substance is first dissolved in oil, then a monomer (e.g. methyl methacrylate) and an appropriate polymerisation reaction catalyst (e.g. benzoyl peroxide).
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In the same way as in the case of forming devices, dropping can occur under the influence of the difference of applied potentials, high-frequency oscillations, rotating disks of different designs and in other ways. Comparison of microcapsules allows us to note that when an electrostatic field is applied, the size of the microcapsules becomes more uniform.