A facile method for the synthesis of ZnS/polystyrene composite particles and ZnS hollow micro-spheres
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In this research studies, a surfactant-free emulsion polymerization method was employed to synthesize nano-ZnS/polystyrene composite particles. In this approach, 2-(dimethylamino)ethyl methacrylate (DMEMA) was used as the auxiliary monomer to co-polymerize with styrene, which provides the locations for coordinating with Zn2+ ions, and finally leads to the formations of ZnS/PS composite particles. It was observed that the resulting nano-ZnS/PS composite particles had the raspberry-like morphology when the process was conducted under low DMEMA content. Upon increasing the DMEMA content, the morphology for ZnS changed to become hollow ZnS micro-spheres. In the method proposed in this study, stable emulsion was successfully obtained under a surfactant-free environment. The possible mechanisms for the formation of the different mechanisms are presented.
KeywordsComposite Particle Hollow Sphere Ethyl Methacrylate Sulfide Source Auxiliary Monomer
The work described in this article is supported by a CityU Strategic Research Grant (No. 7002093).