Comparison of oil-soluble and water-soluble initiation of styrene polymerization in a three-component microemulsion

J. E. Puig, V. H. Pérez-Luna, M. Pérez-González, E. R. Macías, B. E. Rodríguez, E. W. Kaler

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

The polymerization of styrene in three-component oil-in-water microemulsions made with the cationic surfactant dodecyltrimethylammonium bromide is studied by dilatometry and quasielastic light scattering as a function of type and concentration of initiator. Fast polymerization rates, high conversions, and high molecular weight polymers are achieved with both oil-soluble (AIBN) and water-soluble (potassium persulfate) initiators. The rate of polymerization shows initiation and termination intervals, but no constant-rate interval is observed. Stable monodisperse microlatexes are obtained with both types of initiators. For both AIBN and potassium persulfate, polystyrene molecular weight is proportional to initiator concentration [I]-0.4 and particle radii decrease as [I]-0.2. Polymerization initiation occurs in or at the microemulsion droplets, and polymer particles grow by recruiting monomer and surfactant from uninitiated swollen micelles.

Original languageEnglish (US)
Pages (from-to)114-123
Number of pages10
JournalColloid & Polymer Science
Volume271
Issue number2
DOIs
StatePublished - Feb 1993

Keywords

  • Styrene polymerization
  • latex
  • microemulsion
  • polystyrene

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