Acetylacetonyl-based magnetic polymer microsphere and preparation method thereof

Abstract

The invention discloses an acetylacetonyl-based magnetic polymer microsphere and a preparation method thereof. The method includes: firstly copolymerizing acetoacetic acid ethylene glycol methacrylateand an acrylate monomer, adding a cross-linking agent, a photoinitiator, a micromolecular RAFT reagent and a cross-linking agent, taking a macromolecular reversible addition-fragmentation chain transfer agent as a stable dispersing agent, and conducting RAFT photodispersion polymerization to prepare a cross-linked polymer microsphere containing diacetylacetonyl internally; and then swelling the cross-linked polymer microsphere in an organic solvent, adsorbing metal ions by diacetylacetonyl in the microsphere, and carrying out in-situ oxidation reduction under the conditions of heating and catalyst action to obtain the polymer microsphere loaded with magnetism inside. The magnetic polymer microsphere provided by the invention has the characteristics of regular shape, uniform particle size,good monodispersity and stability, and after swelling and reduction in a solvent, can maintain unchanged particle size and particle size distribution, thus having has great application prospects.

Description

technical field [0001] The invention relates to the technical field of polymer materials, more specifically, to an acetylacetone-based magnetic polymer microsphere and a preparation method thereof. Background technique [0002] Magnetic polymer microspheres are usually composed of inorganic magnetic materials and organic polymer materials, and are a new type of inorganic / organic composite materials. Inorganic magnetic nanoparticles bring superparamagnetism to the microspheres, enabling them to be quickly separated under the action of a magnetic field; while organic polymers make the nanoparticles more stable and provide the possibility for subsequent functional applications. In addition to the characteristics of ordinary polymer microspheres, such as uniform particle size, large specific surface area, and good stability, magnetic polymer microspheres also have magnetic responsiveness and diversity of surface functional groups, and can be efficiently removed by various physic...

AI Technical Summary

Problems solved by technology

The magnetic microspheres obtained by this method are characterized by magnetic response because of the magnetic particles inside, and the preparation process is simple, but the shape is irregular, the particle size range is wide, and the surface does not contain functional groups, which limits its further application.

Followed by a two-step method, the typical representative is the swelling method (in-situ method). The first step is to prepare cross-linked monodisperse microspheres by traditional methods such as dispersion polymerization and emulsion polymerization. Ferric ions form coordination bonds or ionic bonds such as: -NH 2 , -COOH, -SO 3 H, -NO 2 etc., the second step is to make the polymer microspheres swell in the solution of iron ions, and the iron ions are absorbed and embedded by infiltration. After raising the temperature, they can be oxidized and reduced in situ under a suitable catalyst to obtain a magnetic polymer. Microspheres; however, the available magnetic components are limited, and the use of functional monomers will interfere with the nucleation period of the polymer, resulting in irregular shapes and uneven particle sizes of magnetic microspheres, and it is impossible to obtain monodisperse functional microspheres, and After the microspheres are swelled and reduced in the solvent, the particle size and particle size distribution of the microspheres will also change greatly, which cannot meet the actual needs

Images