Study of block copolymer micelles. 6. Exit and reentry kinetics of bromoacetonaphthone in aqueous polystyrene-poly(ethylene oxide) block copolymer micelles

Autor:	Mark C. Piton, Ahmad Yekta, Jean Duhamel, Mitchell A. Winnik, Melvin D. Croucher, Gérard Riess, Zdenek Hruska
Rok vydání:	1993
Předmět:	Aqueous solution Aggregation number Quenching (fluorescence) Polymers and Plastics Ethylene oxide Organic Chemistry Photochemistry Micelle Inorganic Chemistry chemistry.chemical_compound chemistry Critical micelle concentration Materials Chemistry Copolymer Polystyrene
Zdroj:	Macromolecules. 26:1825-1828
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma00060a005
Popis:	Phosphorescene quenching kinetics were studied for 4-bromo-1-acetonaphthone (BAN) in water in the presence of a series of polystyrene-poly(ethylene oxide) block copolymer micelles. The quencher, NaNO 2 , remains in the aqueous phase. The exit and entry rate constants for BAN and the micelles are determined: the former rate constant is independent of the micelle size whereas the latter increases linearly with the micelle core radius. These experiments demonstrate that BAN binds only to the surface region of the micelle where it is protected from quenching. Under the experimental conditions, it is established that whenever BAN *3 exits from a micelle, it essentially always reenters the same micelle
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::87f0b46da0eca09ad18c09d24a6e26b0 https://doi.org/10.1021/ma00060a005 Zobrazit plný text záznamu