ORBi: Creutz Serge - Dynamics of poly((dimethylamino)alkyl methacrylate-block-sodium metha-crylate) micelles. Influence of hydrophobicity and molecular architecture on the exchange rate of copolymer molecules

Reference : Dynamics of poly((dimethylamino)alkyl methacrylate-block-sodium metha-crylate) micelles....


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/15015

Title :	Dynamics of poly((dimethylamino)alkyl methacrylate-block-sodium metha-crylate) micelles. Influence of hydrophobicity and molecular architecture on the exchange rate of copolymer molecules
Language :	English
Author, co-author :	Creutz, Serge [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Van Stam, Jan [Katholieke Universiteit Leuven (KUL) > Department of Chemistry > Afdeling voor Spectroscopie en Fotochemie > >]
	De Schrijver, Frans C [Katholieke Universiteit Leuven (KUL) > Department of Chemistry > Afdeling voor Spectroscopie en Fotochemie > >]
	Jérôme, Robert [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Publication date :	10-Feb-1998
Journal title :	Macromolecules
Publisher :	Amer Chemical Soc
Volume :	31
Issue/season :	3
Pages :	681-689
Audience :	International
ISSN :	0024-9297
City :	Washington
Keywords :	[en] self-assembly in solution ; micelle
Abstract :	[en] The dynamic stability of the micellar aggregates formed by amphiphilic block copolymers, i.e., poly((dimethylamino)alkyl methacrylate-b-sodium methacrylate), has been investigated by steady-state fluorescence spectroscopy and size exclusion chromatography. The dynamics of exchange of block copolymer molecules between the micelles, formed in aqueous solution, depend on a manifold of factors, e.g., alkyl substituent in the hydrophobic block, the relation between the hydrophobic and hydrophilic blocks, and the architecture of the block copolymer. All copolymers investigated show a slow unimer exchange with an exchange rate constant on the order of 10-3 s-1, with a difference of a factor of 20 between the fastest and the slowest exchange. It is possible to tune the exchange rate in a controlled way; for instance, an extension or branching of the alkyl chain slows down the exchange rate. The same effect is observed when the hydrophobic/hydrophilic balance of these copolymers is increased or when either the hydrophilic or the hydrophobic moiety of diblocks is divided into two external blocks, leading to a triblock copolymer.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	Akzo Nobel N.V. ; The K. U. Leuven for a postdoctoral grant ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/15015
DOI :	10.1021/ma970987y
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/ma970987y

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