Study On The Synthesis And Characterization Of New Molecularly Imprinted Polymers

Molecular imprinting technology is the preparation of a kind of polymers which has a specific selectivity for a particular target, the polymers is molecularly imprinted polymers. Molecularly imprinted polymers is pass crosslinking polymerization use functional monomer and template molecules, under the action of the initiator, then extract the template molecules from the polymers, which leaves cavities inside the polymers that are complementary in terms of size, shape, and functional group to the template molecules. Molecularly imprinted polymers have the advantages of predetermination, identification and practicability, so they have been extensively application prospect in chromatographic separation, solid-phase extraction, sensors and other relevant fields.Magnetic molecularly imprinted polymers is a kind of new technique for the prepared by combining inorganic magnetic materials with molecular imprinting technology, it not only exhibited excellent magnetic response, but also showed predetermination, identification and practicability of molecularly imprinted polymers. Magnetic molecularly imprinted polymers can be easily collected from the complicated samples by an external magnetic without filtration or centrifugation. so it makes the use of molecularly imprinted polymers easier and faster.In this paper, molecularly imprinted polymers for rhodamine B specific recognition were prepared, in which methacrylic acid as functional monomer and ethylene glycol dimethyl acrylate as cross-linker. The as-prepared polymers were characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), vibrating sample magnetometer (VSM). The research contents in details were as follows:(1) The molecularly imprinted polymers for rhodamine B specific recognition were prepared via precipitation polymerization, in which rhodamine B as template molecule. The effects of the molar ratio of template molecule, functional monomer and cross-linker, the dosage of initiators on adsorption rate, elution effect of various solvent were studied. The as-prepared rhodamine B molecularly imprinted polymers were characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), and its adsorption property onto template molecule was investigated. The results showed that the molecularly imprinted polymers had good recognition performance for the template molecules.(2) Fe3O4 magnetic nanoparticles were prepared by precipitation oxidation method, then it was surface modified with oleic acid. On the surface of modified Fe3O4 nanoparticles. the magnetic molecularly imprinted polymers for rhodamine B specific recognition were prepared, in which rhodamine B as template molecule. The as-prepared rhodamine B magnetic molecularly imprinted polymers were characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The adsorption property of magnetic molecularly imprinted polymers onto template molecules was investigated. The results showed that the magnetic molecularly imprinted polymers had good recognition performance for the template molecules, it had excellent magnetic response, and it can be easily collected by an external magnetic.