Abstract
MgAl-layered double hydroxide (LDH)-armored latexes were produced by Pickering emulsion polymerization of styrene using 2-hydroxyethyl methacrylate (HEMA) and methyl methacrylate (MMA) as auxiliary comonomers.
Highlights
Emulsion polymerization is a widespread process for the production of polymer colloids in aqueous dispersed media, known as synthetic latexes
MgAl-layered double hydroxide (LDH)-armored latexes were produced by Pickering emulsion polymerization of styrene (St) using 2-hydroxyethyl methacrylate (HEMA) and methyl methacrylate (MMA) as auxiliary comonomers
The average particle diameter was strongly dependent on the synthesis conditions and decreased with increasing the amount of MMA and/or the LDH content, indicating that the inorganic particles effectively played the role of a Pickering stabilizer
Summary
Emulsion polymerization is a widespread process for the production of polymer colloids in aqueous dispersed media, known as synthetic latexes. Our group recently described the surfactant-free synthesis of composite latex particles with a patchy IO overlayer through Pickering emulsion polymerization of St and (meth)acrylates, using (meth)acrylic acids (MAA or AA) as auxiliary comonomers.[29] A minimum amount of auxiliary comonomer was required to favor IO adsorption at the latex particle surface, while a too high concentration promoted IO aggregation and latex destabilization. In the particular case of clay minerals, other examples of auxiliary comonomers include MAA,[24] methyl acrylate,[9] and methyl methacrylate (MMA).[24] The concentration of the latter must be carefully adjusted as a too high amount of MMA promotes latex destabilization due to substantial hydrolysis of this monomer under basic conditions as shown by Teixeira et al.[24] for LAPONITE® clay
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