Abstract
Ultrasonically initiated miniemulsion polymerization of styrene in the presence of Fe 3O 4 nanoparticles was successfully employed to prepare polystyrene (PS)/Fe 3O 4 magnetic emulsion and nanocomposite. The effects of Fe 3O 4 nanoparticles on miniemulsion polymerization process, the structure, morphology and properties of PS/Fe 3O 4 nanocomposite were investigated. The increase in the amount of Fe 3O 4 nanoparticles drastically increases the polymerization rate due to that Fe 3O 4 nanoparticles increase the number of radicals and the cavitation bubbles. Polymerization kinetics of ultrasonically initiated miniemulsion polymerization is similar to that of conventional miniemulsion polymerization. PS/Fe 3O 4 magnetic emulsion consists of two types of particles: latex particles with Fe 3O 4 nanoparticles and latex particles with no encapsulated Fe 3O 4 nanoparticles. Fe 3O 4 nanoparticles lower the molecular weight of PS and broaden the molecular weight and particle size distribution. Thermal stability of PS/Fe 3O 4 nanocomposite increases with the increase in Fe 3O 4 content. PS/Fe 3O 4 emulsion and nanocomposite exhibit magnetic properties. PS/Fe 3O 4 magnetic particles can be separated from the magnetic emulsion by an external magnetic field and redispersed into the emulsion with agitation.
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