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An aqueous monomer solution also containing, a crosslinker (methylenebisacrylamide) and an initiator (ammonium persulfate),. Was introduced dropwise with a syringe into a vertical glass column containing hot paraffin oil. The partial gelation of. The droplets which took, place during their sedimentation (about 7 - 9S),Allowed them to maintain their spherical shape and not coalesce during their polymerization (for 2h at about 50 ° C at.) The bottom of the column. A narrow size distribution of beads was achieved for droplets between 1 and 2.5 mm in size. Six. Hydrophilic monomers (acrylamide acrylic acid, 2-acrylamino-2-methyl-1-propanesulfonic acid 2-hydroxyethyl-methacrylate,,,2-vinyl-1-pyrrolidone and sodium styrenic sulfate) were used to illustrate the new methodology.
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