Preparation of monodisperse PMMA microspheres using 2-vinyl-4,4′-dimethylazlactone as a particle Stabilizer |
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| Authors: | Lee G Stanek Steven M Heilmann William B Gleason |
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| Institution: | (1) Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA;(2) Organic Materials Technology Center, 3M Company, St. Paul, MN 55144, USA;(3) Department of Laboratory Medicine & Pathology, University of Minnesota, Minneapolis, MN 55455, USA |
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| Abstract: | Polymeric microspheres of methyl methacrylate (PMMA) have been prepared via emulsion polymerization using potassium persulfate as initiator. The polymeric spheres were also prepared with varied concentration of an additional component, 2-vinyl-4,4′-dimethylazlactone (VDMA), which greatly affected the properties of the spheres. NMR analysis indicates the presence of VDMA in the polymer particles, and FT-IR analysis shows hydrolysis of VDMA in the polymer which produced N-acryloylmethylalanine, (NAMA). The VDMA hydrolysis thus led to carboxyl functionality which served to stabilize the microspheres during the emulsion polymerization showing a significant effect on particle size, distribution, and morphology, but little effect on molecular weight or thermal properties of the polymer. Also the effect of varying the concentration of initiator (potassium persulfate, KPS) was investigated, and had little effect on particle size or distribution or molecular weight of the polymer particles. |
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| Keywords: | Emulsion polymerization PMMA Azlactone Polymerizable surfactant Amino acid |
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