Abstract
Polymerization in direct mini-emulsions is a relatively new polymerization technique which allows the preparation of submicron latex particles within the range 100<particle diameter<500 nm. This process involves the generation of a large population of submicron monomer droplets in water (termed the mini-emulsion) by intensive shear force with the aid of an adequate emulsifier and coemulsifier (or hydrophobe). These stable, homogenized monomer droplets have an extremely large surface area and, therefore, can compete effectively with the monomer-swollen micelles, if present, for the oligomeric radicals generated in water. Monomer droplets may thus become the predominant loci for particle nucleation and polymerization. This article presents a review of the current literature in the field of radical polymerization of conventional monomers and surface-active monomers in direct mini-emulsion systems. Besides a short introduction into some kinetic aspects of radical polymerization in direct emulsion, mini-emulsion and micro-emulsion systems, we mainly focus on the particle nucleation mechanisms and the common and different features between the classical emulsion and finer mini-emulsion polymerization systems. The effects of the type and concentration of initiator, emulsifier, coemulsifier (hydrophobe) and monomer are evaluated. The influence of the complex formation, the close-packed structure, etc. within the mini-emulsion droplet surface layer on the colloidal stability, the nature of the surface film, and the radical entry process are summarized and discussed. These results show that the nature of the coemulsifier (hydrophobe), the weight ratio of emulsifier to coemulsifier, the mechanisms of sonification, the stability of monomer droplets, and the presence or absence of free micelles play a decisive role in the polymerization process.
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Capek, I., Chern, CS. (2001). Radical Polymerization in Direct Mini-Emulsion Systems. In: New Polymerization Techniques and Synthetic Methodologies. Advances in Polymer Science, vol 155. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44473-4_2
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DOI: https://doi.org/10.1007/3-540-44473-4_2
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