Multihollow structured poly(methyl methacrylate)/silver nanocomposite microspheres prepared by suspension polymerization in the presence of dual dispersion agents |
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Authors: | Eun Mi Lee Hyun Woo Lee Jae Hyeung Park Young A. Han Byung Chul Ji Weontae Oh Yulin Deng Jeong Hyun Yeum |
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Affiliation: | (1) Department of Advanced Organic Materials Science and Engineering, Kyungpook National University, Daegu, 702-701, Korea;(2) Department of NanoEngineering, Dong-eui University, Busan, 614-714, Korea;(3) School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332-0620, USA |
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Abstract: | Poly(methyl methacrylate) (PMMA)/silver nanocomposite microspheres with unique multihollow structures were prepared by suspension polymerization in the presence of dual dispersion agents. The addition of a lipophilic emulsifier, polyethylene glycol (30EO) dipolyhydroxystearate (Arlacel P135), not only stabilized water-in-oil (W/O) emulsion, but also converted silver nanoparticles from hydrophilic to lipophilic. When a suspension polymerization dispersion agent, poly(vinyl alcohol), was added to the above W/O emulsion system, a water-in-oil-in-water suspension was formed with silver nanoparticles dispersed in the oil phase. The suspension polymerization was carried out at low temperature with 2,2’-azobis(2,4-dimethylvaleronitrile) as the initiator. When modified silver nanoparticles were added, the rate of polymerization increased slightly. High monomer conversion (about 85%) was obtained in spite of low polymerization temperature of 30 °C. Under controlled conditions, PMMA/silver microspheres with various hollow structures were synthesized. The PMMA/silver microspheres with multihollow structure showed high antibacterial ability. |
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Keywords: | Poly(methyl methacrylate)/silver microspheres Nanocomposite Multihollow structure Suspension polymerization |
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