ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Conductivity of the mixtures of emulsifier with acrylate or methacrylate as a measure of emulsion stability

I. Capek

Polymer Institute, Centre for Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

Abstract: The emulsification of vinyl monomers, such as acrylonitrile, methyl methacrylate, butyl acrylate, ethyl acrylate and two different comonomer mixtures of ethyl acrylate and methyl methacrylate was studied by the conductometric titration method. The dependence of the conductivity on the monomer concentration for a given emulsifier amount of substance ratio nonionic: anionic is described by a curve with minimum and maximum. Fluctuations in the conductivity are expected to result from the sol­ubilization of monomer in emulsifier micelles, from the releasing or tying up the most conductive species from the aqueous phase, from the changes of the surface particle layer and of the molecular volumes for monomers and from the phase inversion and emulsifier transfer between phases. The most stable monomer emulsion was formed in the system containing the most water-soluble monomer. It was found that a pre-emulsification process is time-dependent and is one of the important characteristics of the emulsion polymerization.

Full paper in Portable Document Format: 423a347.pdf

Chemical Papers 42 (3) 347–354 (1988)