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Factors influencing magnetic polymer microspheres prepared by dispersion polymerization
Author(s) -
Zeng Hongmei,
Lai Qiongyu,
Liu Xueqi,
Wen De,
Ji Xiaoyang
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26999
Subject(s) - materials science , polymer , scanning electron microscope , polymerization , dispersion polymerization , fourier transform infrared spectroscopy , coprecipitation , ethylene oxide , ethylene glycol , analytical chemistry (journal) , chemical engineering , magnetic nanoparticles , polymer chemistry , copolymer , nanoparticle , chemistry , composite material , nanotechnology , organic chemistry , engineering
Abstract Magnetic iron oxide (Fe 3 O 4 ) was prepared by a coprecipitation method. Core–shell composite magnetic polymer microspheres with carboxyl groups were synthesized by the dispersion polymerization of styrene and acrylic acid in the presence of magnetic oxide, and dibenzoyl peroxide was used as an initiator. The synthesized magnetic polymer microspheres were characterized with X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and so forth. The results indicated that the product was single‐phase Fe 3 O 4 , and its average size was about 10 nm. The configuration of the microspheres, which contained carboxyl groups, was spherical, and the average size was about 2 μm. The results of vibrating sample magnetometry tests showed that the magnetic powders produced by different surfactants had different saturation magnetizations. When poly(ethylene glycol) with a weight‐average molecular weight of 4000 was used as a surfactant, the saturation magnetization of the samples reached 69.2 emu/g. The factors that affected the shape, magnetism, size, and distribution of the microspheres were also studied. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007