Optimum conditions for preparing micron-sized PMMA beads in the dispersion polymerization using PVA |
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Authors: | Ok Hyung Kim Kangseok Lee Kijung Kim Byung H Lee Soonja Choe |
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Institution: | (1) Department of Chemical Engineering, Inha University, 253 Yonghyundong, Namgu, Incheon, 402-751, South Korea |
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Abstract: | The optimum conditions for preparing micron-sized monodisperse polymethylmethacrylate (PMMA) beads by dispersion polymerization in a methanol/water mixture were proposed. PMMA forming microspheres having an average molecular weight of 55,300 g/mol, 2.6 μm weight-average diameter, with a 5.3% coefficient of variation and 91% conversion, were successfully obtained in the presence of 15 wt.% of polyvinylalcohol (PVA), 100/50 (g/g) of MeOH/water mixtures at 70°C; the reaction lasted for 8 h. Compared to dispersion polymerization using polyvinylpirrolydone, PVA proved to be an extremely stable steric stabilizer in the dispersion polymerization of methylmethacrylate. |
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Keywords: | Dispersion polymerization Monodispersity Micron-size PMMA PVA |
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