Effect of different ligands on the controlled polymerization of monodisperse polystyrene nanospheres by atom transfer radical polymerization in an aqueous emulsion
| Autor: | S. J. Liu, M. Yuan, D. S. Zhao, E. J. Tang, X. Y. Zhao, P. J. Hu, B. Y. Tian |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Polymers and Plastics General Chemical Engineering Dispersity Ligand ATRP Aqueous emulsion polymerizatio lcsh:Chemical technology Styrene Gel permeation chromatography chemistry.chemical_compound Polymer synthesis molecular e Polymer chemistry Materials Chemistry lcsh:TA401-492 lcsh:TP1-1185 Physical and Theoretical Chemistry chemistry.chemical_classification Atom-transfer radical-polymerization Organic Chemistry Polymer chemistry Polymerization Molar mass distribution Polystyrene nanosphere lcsh:Materials of engineering and construction. Mechanics of materials Polystyrene |
| Zdroj: | eXPRESS Polymer Letters, Vol 6, Iss 10, Pp 837-846 (2012) |
| Popis: | Polystyrene nanospheres have been synthesized by atom transfer radical polymerization (ATRP) to control the molecular weight distribution in the aqueous system. The crucial factor in such a system is the ligand that adjusts the solu- bility of the catalyst in different phases to control the concentration of both the activator and the deactivator in reaction phase. The effect of different ligands including ethylenediamine, 1,10-phenanthroline (phen) and 4,4-dinonyl-2, 2-bipyridyl (dNbpy) on the catalytic solubility in the organic and aqueous phase has been investigated. The molecular weight distribu- tion of polymer obtained in this way was analyzed by gel permeation chromatography (GPC). It showed that the obtained polymer particles presented a broad molecular weight distribution (polydispersity index 1.78) with ethylenediamine as the ligand, but the polymerization rate was high and conversion reached 96.8%. The molecular weight distribution of poly- styrene was narrowest with dNbpy as ligand, but the conversion was lowest and only achieved to 69%. Possible reasons were the influence of the structure of three different ligands on the control of ATRP reaction. SEM and GPC indicated that the polystyrene nanospheres presented regular sphere with a diameter of about 120 nm and uniform molecular weight dis- tribution, which possessed a significant potentials in drug carrier field. |
| Databáze: | OpenAIRE |
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