Article (Scientific journals)
Dynamics of poly((dimethylamino)alkyl methacrylate-block-sodium metha-crylate) micelles. Influence of hydrophobicity and molecular architecture on the exchange rate of copolymer molecules
Creutz, Serge; Van Stam, Jan; De Schrijver, Frans C et al.
1998In Macromolecules, 31 (3), p. 681-689
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Keywords :
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 center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering
Chemistry
Author, co-author :
Creutz, Serge;  Université de Liège - ULiège > 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 ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
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
Publication date :
10 February 1998
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
Volume :
31
Issue :
3
Pages :
681-689
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Akzo Nobel [NL]
KU Leuven - Katholieke Universiteit Leuven [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
BELSPO - Service Public Fédéral de Programmation Politique scientifique [BE]
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