Method for preparing magnetic POSS

Abstract

The invention discloses a method for preparing a magnetic POSS compound. The method comprises the steps that first, magnetic spherical Fe3O4 particles are prepared with a coprecipitation method, the diameter of each magnetic spherical Fe3O4 particle is 20 nm, and then dichloromethylsilane or 3-(trimethoxysilyl)propyl methacrylate is used for modifying the magnetic spherical Fe3O4 particles, and magnetic Fe3O4 containing Si-H or C=C is obtained; second, cyclopentyltrichlorosilane carries out self-assembly in an aqueous solution to form cyclopentyl trihydroxy POSS, dichloromethylvinylsilane or trichlorosilane or 3-(trimethoxysilyl)propyl methacrylate is used for modifying the cyclopentyl trihydroxy POSS, and POSS containing Si-H or C=C is obtained; third, the modified Fe3O4 and the modified POSS are processed through hydrosilylation under the condition of a Pt catalyst so that the magnetic POSS can be obtained. The method has the advantages of being easy to operate, low in reaction temperature and easy to implement. The strength of the modified POSS reaches 18.7 emu / g.

Description

technical field [0001] The present invention belongs to Fe 3 o 4 / POSS nanocomposite material field, in particular to a preparation method of magnetic POSS (polyhedral oligomeric silsesquioxane). Background technique [0002] Fe 3 o 4 It is a kind of magnetic particle, which has superparamagnetism when the particle size is less than 50nm. Monodisperse Fe3O4 magnetic nanoparticles have been widely studied due to their potential value in biomedicine and their unique physicochemical properties. Its specific applications involve selective adsorption of heavy metal ions in wastewater, cell separation, drug delivery carriers, tumor treatment, compounding with polymers, catalysts, magnetic fluids, magnetic recording materials, magnetic resonance imaging, etc. Due to Fe 3 o 4 Belongs to the category of inorganic materials, poor compatibility with organic materials, and pure Fe 3 o 4 It is easily oxidized when exposed to the air, has extremely high surface energy, and has se...

AI Technical Summary

Problems solved by technology

Due to the hole structure, Leu Chyi-Ming et al. (Macromolecules2003, 36, 9122-9127) reported that POSS was introduced into polyimide to reduce the dielectric constant of the polymer and achieved a relatively ideal effect. Imine carries out fluorination and reduces dielectric constant, but this method makes the strength of polymer reduce and cost is too high, and introducing POSS can improve the mechanical property of polymer simultaneously; Chinnam Parameswara Rao etc. (Chemistry of Materials2011,23,5111-5121 ) Connect the eight vertices of POSS Polyethylene glycol becomes a block polymer, POSS provides lithium ion channels, and polyethylene glycol supports the formation of the entire polymer structure. The existence of holes makes ion conduction fast and efficient, which greatly improves concentration polarization. phenomenon, and the inorganic core structure of POSS can effectively improve the heat resistance of electrodes. This series of discoveries also brings new opportunities for the application of POSS.