Abstract
Spherical monodisperse vinyl copolymer particles have been prepared using three different techniques: surfactant-free emulsion polymerization (SFEP), precipitation polymerization (PP), and dispersion polymerization (DP). SFEP yielded methacrylic acid (MAA)−styrene (St) (MAA/St = 25/75) copolymer particles with a diameter of ∼200 nm. PP yielded MAA−divinylbenzene (DVB) copolymer particles with a diameter of ∼5 μm (MAA/DVB = 25/75) and of ∼1 μm (MAA/DVB = 60/40), and also glycidyl methacrylate (GMA)−DVB (GMA/DVB = 60/40) copolymer particles with a diameter of ∼4.5 μm. DP was used to prepare GMA−St (60/40) copolymer particles of diameter ∼1.5 μm. Attempts to self-assemble samples of each primary particle into spherical aggregates were made using high solids (33%) aqueous dispersions each in inverse suspension in toluene. Self-assembly was induced by Dean−Stark removal of the water in some of the toluene. No success was achieved with the two largest sized particles. However, both the ∼200 nm and the two 1−1....
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