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Preparation and magnetic properties of [P(St‐co‐AA)]Ni microspheres
Author(s) -
Wang Yanmei,
Wang Youxiang,
Feng Linxian
Publication year - 1997
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/(sici)1097-4628(19970531)64:9<1843::aid-app21>3.0.co;2-x
Subject(s) - coercivity , acrylic acid , microsphere , materials science , carboxylate , polymerization , polymer chemistry , magnetic hysteresis , emulsion polymerization , styrene , polymer , valence (chemistry) , nickel , magnetic susceptibility , nuclear chemistry , analytical chemistry (journal) , chemical engineering , chemistry , magnetization , copolymer , magnetic field , crystallography , composite material , stereochemistry , metallurgy , organic chemistry , physics , quantum mechanics , engineering , condensed matter physics
Seeded emulsifier‐free emulsion polymerization was used to prepare poly(‐styrene‐co‐acrylic acid) [P(St‐co‐AA)] microspheres. There are carboxyl groups on the surface of the P(St‐co‐AA) microspheres. Under appropriate conditions, the carboxyl react with NiCl 2 , etc., to form magnetic [P(St‐co‐AA)]Ni microspheres which exhibit ferromagnetic properties. ESCA analysis shows that the valence of nickel on the surface of the magnetic [P(St‐co‐AA)]Ni microspheres is 2. IR analysis confirmed that there are carboxylate groups present in the magnetic [P(St‐co‐AA)]Ni microspheres. Magnetic properties of this kind of polymer microspheres was studied. Results showed that the magnetic susceptibility decreased with decreases in temperature. The result of magnetic hysteresis loop studies showed that the obtained magnetic microspheres are categorized as magnetically soft materials. The coercive force (Hc) is 32 Oe, and the saturation magnetization is 1.79 emu/g. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1843–1848, 1997