Abstract
Dispersion copolymerization of styrene with a small amount of PEO macromonomer having p-styrylbutyl end group (Mn = 2000) in methanol/water (90/10 vol%) produced monodisperse microspheres of 0.5 to 3 μ in diameter. The particle size increased in proportion to Θ l/3 W o 2/3 (r1/W Do S crit ) 1/2 , a theoretical model based on particles formation sterically stabilized by graft-copolymerized PEO chains on the particle surface, where Θ = styrene conversion, W o = styrene weight in feed, W Do = macromonomer weight in feed, S crit = critical occupancy area per grafted PEO chain, and r 1 = monomer reactivity ratio of styrene before critical conversion. Quantitave agreement between theory and experiment was obtained with S crit /r 1 = 10 nm 2 .
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