Abstract
The effect of stabilizers on the particle formation stage in dispersion polymerization of methyl methacrylate in supercritical CO2 has been studied by in-situ turbidimetry. The average particle diameter (250 nm) and particle number density are similar at the end of this formation stage for the stabilizers poly(dimethylsiloxane)-b-poly(methyl methacrylate-co-methacrylic acid) (PDMS-b-P(MMA-co-MA)) and poly(1,1-dihydroperfluorooctyl acrylate)-b-polystyrene (PFOA-b-PS). Particle diameters are only about twice as large for perfluoropolyether acid (PFPE-COOH) but become much larger for grafted PDMS−monomethacrylate due to less effective surface coverage. The final particle number density changes little for conversions from 1% to completion for PDMS-b-P(MMA-co-MA) but increases for PFOA-b-PS due to formation of new particles in block copolymer micelles.
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