Polymerization of surface‐active monomers. III. Polymer encapsulation of silica gel particles by aqueous polymerization of quaternary salt of dimethylaminoethyl methacrylate with lauryl bromide

Abstract

SynopsisPolymer encapsulation of silica gel particles (SiO,) by aqueous, radical polymerization of a cationic, surface-active monomer, quaternary salt of dimethylaminoethyl methacrylate with lauryl bromide, in the presence of the solid was investigated. The polymerization gave the polymer encapsulating the solid particles ("C-polymer"), though accompanied by the formation of that suspended in form of latex ("L-polymer"). The proportion of C-polymer in the products increased with increasing the amount of SiO, at a constant monomer concentration and only C-polymer was formed under the conditions where the feed ratio of monomer to SiO, is about 0.13 or lower by weight. Increasing the monomer concentration in feed increased slightly the ratio of C-polymer to SO,. The results obtained here suggest that C-polymer is mainly formed through the polymerization of monomer adsorbed on the solid surface. An electron micrograph of the polymer-encapsulated SiO, revealed that the solid particles are uniformly encapsulated with the resulting polymer.

Reactive surfactants in heterophase polymerization

“…The homopolymerization of the reactive surfactant in micelles or vesicles, for which ample literature examples can be found [39,40], is not included. The same applies to the use of surfmers for other purposes such as surface modification [30,41], encapsulation [42,43], and production of polymeric foams [44]. The article is further organized as follows.…”

Encapsulation of Inorganic Particles by Dispersion Polymerization in Polar Media

“…Another example of SiO 2 encapsulation is the polymerization of cationic reac-should be able to attest to the presence or the absence of silica beads in the polymer particles. The most suitable techtive surfactants adsorbed onto the surface of silica gel (18,19), but the nature of the surface of the porous gels involved niques for this purpose are microscopy techniques. An example of a morphological characterization of composite materiin these studies is different from the surface of the highly dispersed nanosized silica particles, and therefore the mecha-als constituted of nanosized silica particles and polyethylacrylate latexes by TEM is given in Ref.…”

“…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. Since silica is (styrene).…”

Preparation of a silica nano–composite emulsion resin and study of properties and behaviors

“…However, the preparation of organic inorganic nanohybrides in the form of emulsion is much preferable because of its easy processability and improving silica affinity to monomers by suitable surfactants. Concerning the surfactant, the use of ionic surfactant with opposite electrical charge to the particle, has previously been reported, the absorbed surfactant on the particle surface is considered to improve the affinity to the organic monomers [2,12], but these studies didnot investigate the effect of silica content or size of particles. Kirsch et al studied scrub resistance and abrasion mechanisms of highly pigmented paints by different scrub techniques, however it was not investigated on recent nanocomposites [13].…”