title: Controllable preparation of magnetic polymer microspheres with different morphologies by miniemulsion polymerization.
abstract: Magnetic poly(styrene-co-acrylic acid-co-acrylamide) microspheres were prepared by water-in-oil-in-water (W/O/W) miniemulsion polymerization of monomers in the presence of Fe3O4 nanoparticles. The copolymerizable monomers of acrylic acid and acrylamide were used not only to modify the surfaces of the microspheres with functional groups, but also to act as viscosity regulators to control the morphology and size of these microspheres. It was experimentally observed that the surfaces of these microspheres were functionalized with NH2 groups produced by copolymerization, the morphologies (sphere, ringlike, and one-hole) of the microspheres were controlled by the concentration of copolymerizable monomers, and all samples prepared were superparamagnetic. The possible mechanism of formation of these magnetic microspheres is also discussed.
authors.affiliation: State Key Laboratory for Modification of Chemical Fiber and Polymers, College of Material Science and Engineering, Donghua University, Shanghai 200051, People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Sun
authors.forename: Biao
authors.initials: B
authors.lastname: Wang
authors.forename: Huaping
authors.initials: H
authors.lastname: Wang
authors.forename: Jianming
authors.initials: J
authors.lastname: Jiang