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4705798 
Journal Article 
Comparative study in magnetic nanocomposites with PMMA and PS matrices made by suspension polymerization 
Karagiovanaki, S; Kg, E; Zoumpoulakis, L 
2012 
1 
Key Engineering Materials
ISSN: 1013-9826
EISSN: 1662-9795 
Key Engineering Materials 
495 
58-+ 
WOS:000302674000014 
Magnetic polymer nanocomposites were synthesized via suspension polymerization method, incorporating nano-Fe3O4 particles into poly(methyl methacrylate) (PMMA) and polystyrene (PS) matrices in order to obtain polymer magnetic microspheres with perspectives in a wide range of applications. The monomer (MMA or Styrene) and magnetic material (pre-made Fe3O4, 20nm in diameter) are mixed together under vigorous stirring and follows suspension polymerization. The product was sequentially filtered through a range of sieves and spherical composites were obtained with grains of sizes ranging from 45 mu m to 250 mu m. The yield of polymerization was 60% to 85% for the two different matrices in samples and the corresponding polymer product contained 1.25wt% to 4.00wt% of Fe3O4. It is observed that increasing the content of magnetite affect the surface morphology of the microspheres. The pure nano-Fe3O4 particles and the magnetic polymer microspheres were characterized using techniques such as X-Ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), optical microscopy and magnetization measurements carried out by a Vibrating Sample Magnetometer (VSM). 
magnetic sensors; magnetic polymer microspheres; suspension polymerization; magnetite nanocomposites