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Preparation and magnetic properties of [P(St-co-AA)]Ni microspheres

โœ Scribed by Yanmei Wang; Youxiang Wang; Linxian Feng

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
193 KB
Volume
64
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

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 were 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.

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