SANS Study of Coated Block Copolymer Micelles
| Autor: | Čestmír Koňák, Zdeňka Sedláková, H. Pospíšil, Isabelle Grillo, Robert Cubitt, Petr Kadlec, Josef Pleštil, Jaroslav Kříž |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry technology industry and agriculture food and beverages Solution polymerization Condensed Matter Physics Micelle Small-angle neutron scattering chemistry.chemical_compound Monomer chemistry Polymerization Critical micelle concentration Polymer chemistry Materials Chemistry Copolymer Physical and Theoretical Chemistry Methyl methacrylate |
| Zdroj: | Macromolecular Chemistry and Physics. 206:1206-1215 |
| ISSN: | 1521-3935 1022-1352 |
| Popis: | Multishell particles were prepared by γ-radiation-induced polymerization of methyl methacrylate (MMA) in polystyrene-block-poly(methacrylic acid) (PS-b-PMA) aqueous micellar solution and their structure was studied by small-angle neutron scattering (SANS). Before polymerization, almost all MMA molecules are distributed in aqueous phase and only 1% of MMA is accumulated inside the micelles. The newly formed polymer (PMMA) is deposited on the surface of PS cores of the original micelles. The effect of the MMA concentration, micelle concentration, absorbed radiation dose, and absorbed dose rate on the characteristics of the resulting particles was examined. The thickness of the PMMA shell (20-218 A for the presented series of samples) can be easily controlled by variation of monomer and/or micelle concentration. Universal plots of the core volume (PS+PMMA) and SANS curve were presented. These plots facilitate choosing proper monomer and micelle concentrations and detecting possible irregularities in the parameters of the resulting particles. |
| Databáze: | OpenAIRE |
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