Preparation, Morphology And Property Of Polymer/inorganic Nanocomposite Via Miniemulsion Polymerization

Polymer-inorganic nanoparticle composites have become one of hot research topics due to combination the advantages of nanoparticle and the polymer. And they have a lot of potential applications in the areas of cosmetic, coatings, catalysis and drug-releasing systems. Dispersion and encapsulation of nanoparticles in the polymer matrix were the important piece of the puzzle for researchers. Miniemulsion polymerization has been proven to be a versatile and efficient way to nanoencapsulation of nanoparticles within host latex particles, which provides an alternative method to overcome the above limitations in the fabrication of microcapsules. Owing to the hydrophobic interior of miniemulsion droplets, each submicrometer droplet could indeed act as a nanoreactor, which produces hybrid microspheres with great encapsulation efficiencies of inorganic particles. In this article, the magnetic-polymer microspheres, raspberry-like SiO2-polymer microspheres and magnetic hollow composite microspherewere successfully prepared via miniemulsion polymerization. Meanwhile, we introduce the morphology of nanoparticle composite. At last, the prospects of asprepared nanoparticle composite are described.In the first chapter, the preparation, morphology and property were briefly introduced during the past decades. Polymer-inorganic nanocomposites can be prepared by many methods such as soap-free emulsion polymerization, Pickering emulsion polymerization and miniemulsion polymerization. Miniemulsion polymerization has been proven to be a versatile and efficient way to nanoencapsulation of nanoparticles within host latex particles, which provides an alternative method to overcome the above limitations in the fabrication of microcapsules. Owing to the hydrophobic interior of miniemulsion droplets, each submicrometer droplet could indeed act as a nanoreactor, which produces hybrid microspheres with great encapsulation efficiencies of inorganic particles.In the second chapter, Monodispersed Fe3O4/PSt composite microspheres with suppermagnetic were prepared by miniemulsion polymerization used St, DVB and oleic acid modified Fe3O4as main materials. Fe3O4/PSt composite microspheres were charactered by transmission electron microscopy (TEM), Thermo Gravimetric Analyzer (TGA) and vibrating sample magnetometer (VSM) and the results showed that had different morphology when used different kinds of initiator. And composite microspheres with19.74%magnetic content were prepared used SDS as anionic emulsifier and AIBN as oil-soluble initiator. Otherwise, the as-prepared composite microspheres were suppermagnetic.In the third chapter, raspberry-like nanoparticle composite microspheres were prepared used redox initiator via miniemulsion. In this chapter, we discussed the schematic illustration for the preparation of nano-composite microspheres and charactered by TEM and high resolution TEM. As the monomers polymerized, TEOS phase was compressed and accumulated to form a liquid core due to the phase separation between polymer and TEOS. After the ammonia was added, silica was in situ formed by the hydrolysis-condensation of TEOS under basic conditions, thus raspberry-like microspheres were successfully prepared. One of the advantages was to obtain the microsphere with high silica content on the surface.In the fourth chapter, magnetic hollow composite microspherewere successfully prepared used St, DVB, TEOS, MPS as main materials. A novel approach has been developed to fabricate magnetic hybrid-shell microcapsule via one-step miniemulsion polymerization by taking full advantage of phase separation between TEOS and polymer during the polymerization of monomers. Furthermore, the inner void size of magnetic hollow microspheres could be easily tuned by adjusting TEOS content. Furthermore analysis of magnetization curves charactered that magnetic hollow composite microspherewith high saturation magnetization.