Abstract
Microemulsion polymerization of butyl acrylate initiated by a water-soluble ammonium peroxodisulfate initiator in the presence of polymeric hydrophobe was investigated. The polymerization rate (without polymer) vs. conversion curve shows two nonconstant rate intervals. The addition of polymeric hydrophobe promotes increase of maximum rate of polymerization, appearance of a rate shoulder at ca. 50—70% conversion and formation of polymer particles with bimodal size distribution. The maximum rate of polymerization increases with initiator concentration, particularly so with predissolved polymer. The enhanced polymerization rate with predissolved polymer is attributed to preservation of monomer droplets and larger number of latex particles. This is observed in runs with a higher weight ratio of monomer to emulsifier. The synergetic effect of predissolved polymer is also attributed to the incompatibility of polymer with (co)emusifier (BA and undissociated emulsifier), which may increase the fraction of micellar emulsifier. The non-stationary rate of polymerization is discussed in terms of continuous particle nucleation, decrease of monomer at the reaction loci, increase in weight ratio emulsifier/monomer or chain transfer to emulsifier and preservation of monomer droplets.
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Capek, I. Microemulsion Polymerization of Butyl Acrylate in the Presence of Polymeric Hydrophobes. Polym J 32, 670–675 (2000). https://doi.org/10.1295/polymj.32.670
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DOI: https://doi.org/10.1295/polymj.32.670