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Microemulsion polymerization: phase behavior driven mechanistic changes

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Abstract

We have examined the phase behavior of anionic microemulsions of the general type water/NaCl–hexyl methacrylate (C6MA)-bis(2-ethylhexyl)sulfosuccinate (AOT)/sodium dodecyl sulfate (SDS) with respect to temperature and composition. Monomer partitioning measurements and kinetic experiments show good agreement with the Morgan model (de Vries et al. in Macromolecules 34:3233, 2001) for droplet-type microemulsions that do not phase separate as monomer is consumed. In contrast, balanced microemulsions, which efficiently solubilize large amounts of monomer, exhibit dramatic effects on the polymerization kinetics as the phase behavior changes. Our findings suggest that the appearance of a liquid crystalline mesophase in the binary water–surfactant system of the respective microemulsion causes a phase separation during polymerization and, thus, a severe deviation from previous mechanistic models.

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Acknowledgements

Part of the material presented is based upon activities supported by Deutsche Forschungsgemeinschaft under grant STR 311/2-1. O.L. is grateful for a visiting scholarship of the University of Delaware.

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Author notes

  1. Oliver Lade

    Present address: Siemens AG, Industriepark Höchst, G811, Frankfurt, 65926, Germany

  2. Carlos C. Co

    Present address: Department of Chemical Engineering, University of Cincinnati, Cincinnati, OH, 45230, USA

Authors and Affiliations

  1. Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, Köln, 50939, Germany

    Oliver Lade & Reinhard Strey

  2. Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering, University of Delaware, Newark, DE, 19716, USA

    Carlos C. Co & Eric W. Kaler

  3. DuPont Company, Central Research and Development, Wilmington, DE, 19880, USA

    Patricia Cotts

Authors
  1. Oliver Lade
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  2. Carlos C. Co
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  3. Patricia Cotts
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  4. Reinhard Strey
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  5. Eric W. Kaler
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Corresponding author

Correspondence to Reinhard Strey.

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Lade, O., Co, C.C., Cotts, P. et al. Microemulsion polymerization: phase behavior driven mechanistic changes. Colloid Polym Sci 283, 905–916 (2005). https://doi.org/10.1007/s00396-004-1238-5

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  • DOI: https://doi.org/10.1007/s00396-004-1238-5

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