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In this study, nonswellable and swellable poly(ethylene glycol-dimethacrylate) microspheres, in the size range of 20–177 μm, were produced by conventional and modified suspension polymerizations of ethylene glycol-dimethacrylate (EGDMA) in an aqueous medium. Poly(vinyl alcohol) and benzoyl peroxide were used as the stabilizer and the initiator. A diluent, i.e., toluene, was included in the polymerization recipe of the modified suspension polymerization. The microspheres were characterized by optical microscopy, FTIR, and FTIR-DRS. Highly crosslinked, transparent, and nonswellable poly(EGDMA) microspheres were obtained with the conventional suspension polymerization procedure. While the modified suspension polymerization provided swellable, opaque, and crosslinked copolymer microspheres.
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Tuncel et al. (1996) studied this question.
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