Encapsulating polymerization of titanium dioxide

Abstract

Titanium dioxide was encapsulated in polymethyl methacrylate and polystyrene by the emulsion polymerization process, and the influence of various polymerization conditions such as the monomer and initiator concentrations and amounts of titanium oxide on the polymerization behavior was investigated. In the polymerization mixture where the end of the polymer chain and the metal oxide surface are oppositely charged, unextractable polymer is formed well. The encapsulating polymers show special structures with high molecular weight and high density. ZUSAMMENFASSUNGTitandioxid wurde durch Emulsionspolymerisation mit Polymethylmethacrylat und Polystyrol verkapselt. Der EinfluD der Monomer-, Initiator-und Ti0,-Konzentration und des pH-Wertes der Emulsion wurde untersucht. In den Emulsionen, in denen die Kettenenden und die MetalloxidoberflBche entgegengesetzt geladen sind, bildet sich nichtextrahierbares Polymeres. Die Kapselpolymeren haben ein hohes Molekulargewicht und eine hohe Dichte, was auf spezielle Strukturen der Polymeren hinweist. 0 1991 Hiithig & Wepf Verlag, Basel CCC 0003-3146/91/$03.00

Synthesis and Characterization of Silica/Poly (Methyl Methacrylate) Nanocomposite Latex Particles through Emulsion Polymerization Using a Cationic Azo Initiator

“…Fifty-eight weight percent of the total amount of polymer synthesized was surrounding the silica beads, whereas 42% resulted in separate free latex particles. The polymer content of the nanocomposite particles was compared to the values reported in the literature for the coating of titanium dioxide pigments using soapless (19) and conventional emulsion polymerizations (16). The amount of coating polymer (e.g., 52 wt% in case of run 5) was found to be more than twice the literature data.…”

Synthesis of composite particles through emulsion polymerization based on silica/fluoroacrylate-siloxane using anionic reactive and nonionic surfactants

“…First, the nature of the particle surface plays an active role in the issue of the process. Therefore to favor electrostatic or hydrophobic interactions between the polymer and the inorganic particle surface, nonionic surfactants, amphiphilic polymers, and grafted coupling agents were used to modify the surface of the filler [22]. Second, the use of highly hydrophilic monomers (methyl methacrylate, vinyl acetate, ethyl acetate) is preferred to hydrophobic ones.…”

Encapsulation of Inorganic Particles by Dispersion Polymerization in Polar Media

“…Among dispersion composites composed of organic-inor-phiphilic polymers, and grafted coupling agents were used to modify the surface of the filler (30). Secondly, the use ganic materials obtained by emulsion polymerization, only few encapsulation studies have been performed on silicon of highly hydrophilic monomers (methyl methacrylate, vinyl acetate, ethyl acetate) are preferred to hydrophobic ones dioxide (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29), although synthetic silicas have gained importance in numerous fields of application.…”