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Poly(Vinyl Toluene) Model Latices

  • P. Bagchi
  • B. V. Gray
  • S. M. Birnbaum

Abstract

A set of monodisperse model poly(vinyl toluene) latices was prepared in the presence of sodium dodecyl sulfate as an emulsifier, with particle radii varying from 0.04 to 0.08 μm and with a constant surface charge density of about 0.5 to 0.6 μC/cm2 arising from the complete and pH-independent dissociation of strongly attached sulfate groups. Surface tension measurements indicated that the adopted purification procedure removed all the emulsifier from the continuous phase. A quick and novel microelectrophoretic technique used for the determination of the electrokinetic characteristics of these very small latices involved the determination of the electrophoretic mobilities of a strongly scattering substrate covered with a layer of adsorbed latices, as has been used for biomacromolecules. Results of such experiments were compared with those obtained from extremely time-consuming conventional moving-boundary experiments. Determinations of ψo (eψo /KT ~ 2) of these latices by ion exchange and subsequent titration and of ψζ from electrophoresis show that for these model latices ψ0 = ψζ, indicating the absence of a Stern layer. The low surface potential and the absence of a Stern layer indicate that the latex systems can be used as ideal Gouy-Chapman model colloids.

Keywords

Sodium Dodecyl Sulfate Composite Particle Latex Particle Surface Charge Density Conductometric Titration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • P. Bagchi
    • 1
  • B. V. Gray
    • 1
  • S. M. Birnbaum
    • 1
  1. 1.Research LaboratoriesEastman Kodak CompanyRochesterUSA

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