Light Scattering, Atomic Force Microscopy and Fluorescence Correlation Spectroscopy Studies of Polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) Micelles

0181759 - UFCH-W 20030198 RIV CZ eng J - Článek v odborném periodiku
Štěpánek, M. - Humpolíčková, J. - Procházka, K. - Hof, Martin - Tuzar, Zdeněk - Špírková, Milena - Wolff, T.
Light Scattering, Atomic Force Microscopy and Fluorescence Correlation Spectroscopy Studies of Polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) Micelles.
Collection of Czechoslovak Chemical Communications. Roč. 68, č. 10 (2003), s. 2120-2138. ISSN 0010-0765
Grant CEP: GA MŠMT LN00A032; GA ČR GA203/01/0536; GA ČR GA203/01/0735
Výzkumný záměr: CEZ:AV0Z4050913; CEZ:AV0Z4040901
Klíčová slova: block copolymer micelles * water-soluble polymers * polystyrene
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 1.041, rok: 2003

Polymeric nanoparticles formed by triblock copolymer polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide), PS-PVP-PEO, in aqueous media were studied by a combination of fluorescence correlation spectroscopy with other fluorescence techniques, by light scattering and atomic force microscopy. The studied polymeric nanoparticles exist in the form of (i) core/shell micelles in acid solution at pH lower than 4.8 and (ii) three layer onion micelles at higher pH. Since water is very strong precipitant for PS, both types of micelles have kinetically frozen spherical PS cores. The cores of micelles in acid media are surrounded by soluble shells formed by partially protonated PVPH+ and PEO, while the cores of micelles in alkaline media are surrounded by compact insoluble layers from deprotonated PVP and soluble PEO shells. The micellization behavior of PS-PVP-PEO micelles is accompanied by secondary aggregation of micelles, which is provoked by stirring.
Trvalý link: http://hdl.handle.net/11104/0078281