| 초록 |
Stable aqueous latexes of poly(2-ethylhexyl acrylate) (PEHA) were formed by RESS(rapid expansion of supercritical solutions) of a PEHA suspension in CO2. Two surfactants, one CO2-philic and the other hydrophilic (yet soluble in CO2) were added to monomer and initiator in CO2 and the suspension was formed by dispersion polymerization. The aqueous latexes were stable for up to weeks, especially when sonicated, and concentrations reached 15.6%. The latexes were more stable in basic buffers than in pure water due to more effective deprotonation of the anionic stabilizer. This method produces stable latexes of micron-sized latex particles with minimal amounts of hydrophilic surfactants.
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