Application of polymerizable surfactant in the preparation of polystyrene/nano-Fe₃O₄ composite

Abstract

Monooctadecyl maleate, as a polymerizable surfactant, was synthesized by the mono-esterification of maleic anhydride and octadecanol, and was utilized to surface-modify nano-Fe₃O₄ particles. A polymerizable magnetic fluid was obtained by directly dispersing modified nano-Fe₃O₄ particles into styrene monomer, and the polystyrene/nano-Fe₃O₄ composite was prepared through free radical polymerization of polymerizable magnetic fluid. The structure and dispersion status in different dispersion phases of modified nano-Fe₃O₄ particles were studied by Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The experimental results show that the nano-Fe₃O₄ particles modified by monooctadecyl maleate with the size of about 7–10 nm can be uniformly dispersed into styrene and fixed in the composite during the procedure of polymerization. Thermogravimetric analysis (TGA) and vibrating sample magnetometry (VSM) indicate that the thermal stability of polystyrene/nano-Fe₃O₄ composite is improved compared to that of pure polystyrene, and the composite is a sort of superparamagnetic materials.

Keywords

polymerizable surfactant / nano-Fe₃O₄ particles / polystyrene / composite

References

[1] Frenkel J., Dorfman J. Spontaneous and Induced Magnetization in Ferromagnetic Bodies[J]. Nature, 1930, 126: 274-275.

[2] Kittel C. Theory of the Structure of Ferromagnetic Domains in Films and Small Particles[J]. Phys. Rev., 1946, 70: 965

[3] Cui Sheng, Shen Xiaodong, Lin Benlan, et al. Surface Organic Modification of Fe₃O₄ Magnetic Nanoparticles[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2008(8): 436–439

[4] Lee D. K., Kang Y. S., Lee C. S., . Structure and Characterization of Nanocomposite Langmuir-Blodgett Films of Poly(maleic monoester)/Fe₃O₄ Nanoparticle Complexes[J]. J. Phys. Chem. B, 2002, 106: 7267-7271.

[5] Health P., Wandida C. A., Timothy G., . Structural and Magnetic Properties of Nanoscale Iron Oxide Particles Synthesized in the Presence of Dextran or Polyvinyl Alcohol[ J]. J. Magn. Magn. Mater., 2001, 225: 41-46.

[6] Zhang Jing, Yu Demei, Chen Wei, et al. Preparation of Poly(styrene-glucidylmethacrylate) Fe₃O₄ Composite Microspheres with Hhigh Magnetite Contents[J]. Journal of Magnetism and Magnetic Materials, 2009: 572–577

[7] Wang Xiaocong, Liu Jing, Feng Xuefeng, et al. Fabrication of Hollow Fe₃O₄-Polyaniline Spheres with Sulfonated PolyStyrene Templates[J]. Materials Chemistry and Physics, 2008: 319–321

[8] Grigoriev D., Gorin D., Sukhorukov A., . Polyelectrolyte/magnetite Nanoparticle Multilayers: Preparation and Structure Characterization[J]. Langmuir, 2007, 23(24): 12388-12396.