Synthesis of P(St-MAA)-Fe₃O₄/PPy core¨Cshell composite microspheres with conductivity and superparamagnetic behaviors

详细信息    查看全文

• 作者：Huiqiang Chen ; Wei Wang ; Guoliang Li ; Chao Li ; Ying Zhang  ; ;   ; ^{zhangy@snnu.edu.cn}
• 关键词：Magnetic particles ; Polypyrrole ; Core&ndash ; shell structure ; Composite materials
• 刊名：Synthetic Metals
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：161
• 期：17-18
• 页码：1921-1927
• 全文大小：1176 K

文摘

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¨Cshell 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 ¨CCOOH 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 superparamagnetism. The electrical conductivity of the composite microspheres largely depended on the PPy loading amount in the outer layer.