Korea Polymer Journal, Vol.2, No.1, 54-60, April, 1994
Synthesis of Crosslinked Poly(methyl methacrylate) Beads in Emulsifier-free Emulsion Polymerization
Monodisperse poly(methyl methacrylate) beads were prepared in a single stage emulsion polymerization in the absence of emulsifier. The size of poly(methyl methacrylate) beads was almost independent of the polymerization temperature between 60℃ and 90℃. Difference in the molecular weight and molecular weight distribution between polystyrene and poly(methyl methacrylate) suggests that the reaction takes place via a different polymerization mechanism. In order to use poly(methyl methacrylate) beads as filler particles in polymer composites, they were copolymerized with a crosslinking agent, such as allyl methacrylate or ethylene glycol dimethacrylate. Bead size remained unchanged with the variation of crosslinking density. While glass transition temperature increased with increasing concentrration of crosslinking agent. A higher glass transition temperature maninfests that ethylene glycol dimethacrylate is a better crosslinking agent than allyl methacrylate. 5 mol% crosslinking resulted in a 20℃ increase in glass transition temperature.
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