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Characterization of magnetic poly(methyl methacrylate) microspheres prepared by the modified suspension polymerization
Author(s) -
Chen YiHung,
Liu YiYou,
Lin RongHsien,
Yen FuShan
Publication year - 2008
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.27644
Subject(s) - superparamagnetism , materials science , methyl methacrylate , dispersity , suspension polymerization , divinylbenzene , thermogravimetric analysis , poly(methyl methacrylate) , chemical engineering , particle size , scanning electron microscope , magnetite , polymerization , polymer chemistry , copolymer , composite material , magnetization , polymer , styrene , physics , quantum mechanics , magnetic field , engineering , metallurgy
The study focuses on the characterization of the superparamagnetic microspheres of poly(methyl methacrylate) (PMMA) prepared by the modified suspension polymerization. The nano‐sized oleic acid‐coated magnetite particles (OMP) mixed with methyl methacrylate (MMA) monomers and divinylbenzene were employed to produce the nonporous superparamagnetic PMMA microspheres. The morphology, composition and magnetic properties of the magnetic PMMA microspheres were characterized with the scanning electron microscopy, particle size analyzer, transmission electron microscopy, X‐ray diffraction, thermogravimetric analysis, and superconductor quantum interference device. As a result, the obtained PMMA microspheres had the average particle size of 1.8–6.8 μm and magnetite content of 4.74–10.85 wt %. The corresponding saturation magnetization of the PMMA microspheres was in the range of 2.04–8.51 emu/g. The diameter of the PMMA microspheres showing the polydispersity significantly decreased with the higher weight ratio of OMP to MMA. On the contrary, the magnetite content and saturation magnetization of the PMMA microspheres would increase with the higher weight ratio of OMP to MMA. Furthermore, the distinct relationships between the characteristics of magnetic PMMA microspheres and the weight ratio of OMP to MMA have been proposed. The magnetic PMMA microspheres show the good stability in the solution with the pH region of 2.1–12.9. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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