Synthesis of ZnO/polystyrene composites particles by Pickering emulsion polymerization |
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Authors: | Jui Hung Chen Wen-Yen Chiu Chia-Fen Lee |
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Institution: | a Institute of Polymer Science and Engineering, National Taiwan University Taipei 106, Taiwan b Department of Chemical Engineering, National Taiwan University Taipei 106, Taiwan c Department of Cosmetic Science, Chia Nan University of Pharmacy and Science, Tinan 717, Taiwan d Taiwan Textile Research Institute, Taipei 236, Taiwan |
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Abstract: | ZnO/polystyrene composite particles were synthesized by Pickering emulsion polymerization. ZnO nanoparticles were first prepared by reaction of zinc acetate and sodium hydroxide in ethanol medium. Then different amount of styrene monomer was emulsified in water in the presence of ZnO nanoparticles either by mechanical stirring or by sonication, followed by polymerization of styrene. Two kinds of initiators were used to start the polymerization, azobisisobutyronitrile (AIBN) and potassium persulfate (KPS). The X-ray diffraction pattern verified the crystal structure of ZnO and FT-IR spectra evidenced the existence of ZnO and polystyrene (PS) in ZnO/polystyrene composite particles. Different morphologies were observed for the composite particles when using different initiators. From TEM photographs, AIBN-initiated system produced mainly core-shell composite particles with PS as core and ZnO as shell, while KPS-initiated system showed both composite particles and pure PS particles. Two schemes of reaction mechanism were proposed to explain the morphologies accordingly. Both systems of composite particles showed good pH adjusting ability. |
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Keywords: | ZnO Polystyrene Composite particles Pickering emulsion polymerization |
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