A facile route to hollow superparamagnetic magnetite/oolystyrene nanocomposite microspheres via inverse miniemulsion polymerization

作者：Yang Song; Liu Huarong^*; Zhang Zhicheng

来源：Journal of Polymer Science Part A: Polymer Chemistry , 2008, 46(12): 3900-3910.

DOI：10.1002/pola.22700

• emulsion polymerization
• irradiation
• magnetic polymers
• nanocomposites

In this article, we report a facile route to the preparation of hollow superparamagnetic magnetite/polystyrene nanocomposite microspheres via inverse miniemulsion polymerization at room temperature and under ambient pressure. Water droplets act as a soft template for the formation of hollow structure. Meanwhile, the existence of amphipathic magnetite nanoparticles (MPs) which can assemble at the interface of W/O is favorable to the interfacial polymerization of styrene, ensuring the formation of hollow nanocomposite microspheres. The final products were thoroughly characterized by X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FTlR), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS), which showed the formation of hollow magnetite/polystyrene nanocomposite microspheres. Magnetic hysteresis loop measurements revealed that both MPs and hollow nanocomposite microspheres displayed superparamagnetism. The effects of the content of H2O, sorbitan monooleate (Span 80) and styrene and the dose rate on the morphology of nanocomposite microspheres were studied. Furthermore, the mechanism of the formation of the hollow magnetic microspheres was also discussed.

• 出版日期2008-6-15
• 单位中国科学技术大学