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Preparation of Magnetic Polymer Microspheres

Author: XuZhiZhong
Tutor: WangChangChun；FuShouKuan；HuJianHua；YangWuLi
School: Fudan University
Course: Polymer Chemistry and Physics
Keywords: Magnetic MHD Iron oxide Nanoparticles Magnetorheological Chemical precipitation Polymethyl methacrylate Oleic Superparamagnetic Magnetic resonance imaging Contrast agent Styrene Miniemulsion Acrylamide N , N' - methylene -bis-acrylamide Tetraethylorthosilicate Methacrylic -2 - ( N , N - dimethylamino) ethyl N- isopropyl acrylamide Silica Free emulsion polymerization Thermosensitive 2,2 '- azobis ( 2 - amidinopropane hydrochloride salt) zeta potential Framboidal
CLC: O631
Type: PhD thesis
Year: 2005
Downloads: 1805
Quote: 6
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Abstract


Magnetic polymer microspheres refers to the polymer with inorganic magnetic particles combined to form a certain magnetic and the special structure of the composite microspheres by a suitable method. From the current literature, can be divided into three categories: ① nuclear inorganic magnetic materials, shell polymer; ② The core polymer shell inorganic magnetic materials; ③ The inner and outer layers of the polymer, the middle layer of the sandwich structure of the magnetic material. Compared with conventional microspheres with superparamagnetic magnetic polymer microspheres can be the role of the external magnetic field rapidly separated from the mixture. Because of the advantages of magnetic polymer, in the past few decades, numerous scientists use a variety of experimental methods were prepared performance and structure of different magnetic polymer microspheres. So far, these structural product preparation are generally three types: one is obtained through the inorganic particles of natural or synthetic polymer wrapped magnetic magnetic polymer composite microspheres, it is a the earlier class method of the preparation of magnetic polymer microspheres; another kinds of precipitation within the porous polymer is developed by Ugelstad molysite - layer polymer treated and then wrapped magnetic polymeric microspheres; third is a method is currently the most used, it is in the inorganic magnetic The particles in the presence of polymerization of the monomers in the preparation of magnetic polymer microspheres. This article miniemulsion method and soap-free emulsion polymerization prepared magnetic polymer microspheres of different structure, then the performance of the microspheres for X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), dynamic light scattering (DLS), Fourier transform infrared (FTIR) and vibrating sample magnetometer (VSM) with characterizations, the results obtained are mainly the following aspects: 1. the FeCl 2 .4 H 2 O and FeCl 3 .6 H 2 O as a source of iron, NH 3 . H 2 O bases, prepared Fe 3 O 4 particles by chemical precipitation. Was added during the preparation of the hydrophilic polymer polymethyl methacrylate and the hydrophobic oleic acid-modified Fe 3 the O 4 particles Modified Fe 3 O 4 particle shape is oval and round, the particle size of about 10 nm were superparamagnetic, water-based and oil-based magnetic fluid can stabilize save with magneto-rheological phenomena. Prepared magnetic fluids used in oil and water separation and used as MRI contrast agent research, to obtain better results. The oleic acid modified Fe 3 O 4 dispersed in the styrene monomer, sodium dodecyl sulfate as emulsifier, BPO as initiator, with ultrasound preparation of a stable O / W type miniemulsion, and then the miniemulsion was added to the aqueous solution of 80 ° C. the polymerization Fe 3 O 4 / PSt composite microspheres. The size of the magnetic polymer microspheres prepared in the sub-micron range, the particle size is relatively uniform Fe 3 O 4 better polystyrene wrapped magnetic response strong. A particle size of the the magnetic of Fe 120nm about 3 O 4 / of PSt-the DVB-tBMA was microspheres were prepared in the similar manner. When the tBMA an amount of the 10% and 20% of the total amount of monomer, the magnetic polymer microspheres after hydrolysis, the microspheres can not be stably dispersed in water, when

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers
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