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6615286 
Journal Article 
Synthesis and properties of micron-size magnetic polymer spheres with epoxy groups 
Liu, XQ; Guan, YP; Xing, JM; Ma, ZY; Liu, HH; , 
2003 
Yes 
Chinese Journal of Chemical Engineering
ISSN: 1004-9541 
CHEMICAL INDUSTRY PRESS CO LTD 
BEIJING 
731-735 
WOS:000187739500021 
Micron-size superparamagnetic poly (styrene-divinylbenzene-glycidyl methacrylate) (PSt-DVB-GMA) spheres were prepared via a modified suspension copolymerization method. Oleic acid coated magnetite (Fe3O4) nanoparticles made by co-precipitation were first mixed with monomers of St, DVB, GMA, and benzoyl peroxide (BPO) to form oil in water suspension with the presence of poly(vinyl pyrrolidone) (PVP-K30) as a stabilizer. Then the temperature of mixture was increased at a controlled rate to obtain small and relatively uniform droplets. Finally, the copolymerization reaction was initiated by the decomposition of BPO. The morphology and properties of magnetic PSt-DVB-GMA microspheres were examined by SEM, TEM, VSM, XRD and FT-IR. The magnetic microspheres obtained have very small size (about 4-7 mum) in diameter with narrow size distribution and superparamagnetic characteristics. Powder X-ray diffraction measurements show the inverse cubic spinel structure for the magnetite dispersed in polymer microspheres. FT-IR spectroscopy indicates extensive oxirane groups existed on the surface of magnetic PSt-DVB-GMA microspheres.