Synthesis and characterization of magnetic and non-magnetic core–shell polyepoxide micrometer-sized particles of narrow size distribution

Core polystyrene microspheres of narrow size distribution were prepared by dispersion polymerization of styrene in a mixture of ethanol and 2-methoxy ethanol. Uniform polyglycidyl methacrylate/polystyrene core–shell micrometer-sized particles were prepared by emulsion polymerization at 73 °C of glycidyl methacrylate in the presence of the core polystyrene microspheres. Core–shell particles with different properties (size, surface morphology and composition) have been prepared by changing various parameters belonging to the above seeded emulsion polymerization process, e.g., volumes of the monomer glycidyl methacrylate and the crosslinker monomer ethylene glycol dimethacrylate. Magnetic Fe3O4/polyglycidyl methacrylate/polystyrene micrometer-sized particles were prepared by coating the former core–shell particles with magnetite nanoparticles via a nucleation and growth mechanism. Characterization of the various particles has been accomplished by routine methods such as light microscopy, SEM, FTIR, BET and magnetic measurements.

Magnetite/polyglycidyl methacrylate/polystyrene micrometer-sized magnetic particles of narrow size distribution were prepared using uniform polyglycidyl methacrylate/polystyrene core–shell microspheres. Magnetic Fe3O4 nanoparticles were coated on the microspheres by nucleation followed by controlled growth.Figure optionsDownload as PowerPoint slide