Abstract
Stable inverse latexes of water-swollen polyacrylamide particles stabilized by Aerosol OT (AOT) and dispersed in toluene have been synthesized using a microemulsion polymerization procedure. The structure of the microemulsions prior to polymerization and of the final latexes was studied by elastic and quasielastic light scattering, ultracentrifugation, and viscometry experiments. The dimensions of the micellar particles increase with water or acrylamide contents, whereas the size distribution is not affected. Addition of acrylamide to the AOT/water/toluene system leads to an enhancement of the attractive interaction forces between particles, due to the localization of the monomer at the W/O interface. The final dispersions are shown to consist of two species of particles in equilibrium: polymer particles ( d ∼ 400 A ̊ ) with a narrow size distribution and small AOT micelles ( d ∼ 30 A ̊ ). Each latex particle contains a small number of high-molecular-weight polyacrylamide molecules ( M ̄ v > 10 6 ) in a collapsed state.
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