pH-dependent micellization of poly(2-vinylpyridine)-block-poly((dimethylamino) ethyl methacrylate) diblock copolymers

[en] A series of poly(2-vinylpyridine)-block-poly((dimethylamino)ethyl methacrylate) diblock copolymers (P2VP-b-PDMAEMA) have been synthesized by living anionic polymerization of the comonomers. Dynamic light scattering (DLS) has been used to study the associative behavior of these copolymers in water as a function of copolymer composition, pH, ionic strength, and temperature. Three association regimes are observed. At low pH, loose aggregates are formed, although both the P2VP and PDMAEMA blocks are protonated. At intermediate pH, micelles are observed that consist of an uncharged hydrophobic P2VP core surrounded by a protonated PDMAEMA corona. At higher pH, the PDMAEMA corona is essentially uncharged and collapses at temperatures higher than 40 °C, which results in unstable micelles. The micelles observed by transmission electron microscopy are spherical.

Research Center/Unit :

Center for Education and Research on Macromolecules (CERM)

Disciplines :

Chemistry
Materials science & engineering

Author, co-author :

Gohy, Jean-François; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Antoun, Sayed; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Language :

English

Title :

pH-dependent micellization of poly(2-vinylpyridine)-block-poly((dimethylamino) ethyl methacrylate) diblock copolymers

Publication date :

09 October 2001

Journal title :

Macromolecules

ISSN :

0024-9297

eISSN :

1520-5835

Publisher :

Amer Chemical Soc, Washington, United States - Washington

Volume :

Issue :

Pages :

7435-7440

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://pubs.acs.org/doi/pdf/10.1021/ma010535s

Name of the research project :

SUPERNET program

Funders :

BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
ESF - European Science Foundation

Available on ORBi :

since 25 March 2009

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