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You have to make sure that the ratio of monomer to initiator is in the appropriate range. On the other hand, the molecular weight and concentration of your PEO should not be too high to induce depletion interaction, which will flocculate your system, sometimes even arrest your system into a gel. Furthermore, SDS is the essential part for the stabilization of your polymer particles, the amount should be higher than a critical value to make your system quite stable for the suspension polymerization.
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