title: A novel preparation of surface-modified paramagnetic magnetite/polystyrene nanocomposite microspheres by radiation-induced miniemulsion polymerization.
abstract: A novel and facile approach to the preparation of paramagnetic magnetite/polystyrene nanocomposite microspheres by 60Co gamma-ray radiation-induced miniemulsion polymerization is reported. First, we modified the magnetite nanoparticles (MPs) with a Y-shaped surfactant: 12-hexanoyloxy-9-octadecenoic acid (HOA). Nanocomposite microspheres consisting of polystyrene-iron oxide nanoparticles then were prepared by the radiation-induced miniemulsion polymerization of styrene in the presence of HOA-modified MPs using HOA as stabilizer. The final products were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The effects of the dose rate, the amounts of added hexadecane (HD) and MPs, and the morphology of the final products were studied. We have also studied the polymerization kinetics to prove the miniemulsion polymerization mechanism of the nanocomposite microspheres.
authors.affiliation: Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Qian
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yun
authors.initials: Y
authors.lastname: Chen
mesh_terms: D004655:Emulsions / Q000138:chemical synthesis; D052203:Ferrosoferric Oxide / Q000138:chemical synthesis* / Q000737:chemistry; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D053761:Nanocomposites / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis; D011137:Polystyrenes / Q000138:chemical synthesis* / Q000737:chemistry; D011827:Radiation; D017550:Spectroscopy, Fourier Transform Infrared; D013229:Stearic Acids / Q000138:chemical synthesis / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000138:chemical synthesis* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: C534237:12-hexanoyloxy-9-octadecenoic acid; D004655:Emulsions; D011108:Polymers; D011137:Polystyrenes; D013229:Stearic Acids; D013501:Surface-Active Agents; D052203:Ferrosoferric Oxide