Journal
SYNTHETIC METALS
Volume 161, Issue 17-18, Pages 1921-1927Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2011.06.036
Keywords
Magnetic particles; Polypyrrole; Core-shell structure; Composite materials
Funding
- Natural Sciences Foundation of China [20373039]
- Science and Technology Planning Project of Shaanxi Province of China [2011K08-14]
- Natural Science Foundation of Shaanxi Province of China [2007E106]
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Styrene (St) and methacrylic acid (MAA) copolymers were synthesized by emulsion polymerization using Fe3O4 particles modified by oleic acid as central components. P(St-MAA)-Fe3O4/PPy (polypyrrole) core-shell composite microspheres with conducting and supermagnetic behaviors were obtained via in situ chemical oxidative polymerization on the surface of the P(St-MAA)-Fe3O4 magnetic composite microspheres. The -COOH groups in the composites acted as co-dopants in the formation of PPy and adsorbed the pyrrole monomers onto the surface of P(St-MAA)-Fe3O4. The P(St-MAA)-Fe3O4/PPy composite microspheres have been extensively characterized by transmission electron microscope (TEM), Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The Fe3O4 particles were coated within P(St-MAA) polymers when the volume ratio of MAA to St was maintained at 1:5 during the co-polymerization process. The P(St-MAA)-Fe3O4/PPy multi-component composite microspheres show excellent super-paramagnetism. The electrical conductivity of the composite microspheres largely depended on the PPy loading amount in the outer layer. (C) 2011 Elsevier B.V. All rights reserved.
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