Preparation of acrylic latexes with dispersed magnetite nanoparticles

Latexes based on ethyl methacrylate and acrylic acid with dispersed magnetite particles were obtained using the technique of miniemulsion polymerization. The polymerizations were carried out (using AIBN as the initiator) after the dispersion of magnetite particles hydrophobized with oleic acid in the acrylic monomers and miniemulsion formation with sodium dodecyl sulfate. Latex nonvolatile content, as well as thermogravimetric behavior of dry solid particles were a function of oleic acid content. Atomic force microscopy analysis of films formed with these latexes revealed the occurrence of ordered patterns on their surfaces.