Stabilized mixed micelles with a temperature-responsive core and a functional shell

[en] Formation and stabilization of multiresponsive micelles with a mixed poly(ethylene oxide)/polyelectrolyte shell and a temperature-responsive poly(propylene oxide) core were studied. Various poly(ethylene oxide)block-poly(propylene oxide)-block-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers were mixed with poly(acrylic acid)-block-poly(propylene oxide)-block-poly(acrylic acid) (PAA-PPO-PAA) or poly(dimethylaminoethyl methacrylate)-block-poly(propylene oxide)-block-poly(dimethylaminoethyl methacrylate) (PD-MAEMA-PPO-PDMAEMA) triblock copolymers. The micelles formed by binary mixtures of well-defined compositions at a specific pH were additionally stabilized by loading with pentaerythritol tetraacrylate (PETA), that was polymerized and cross-linked "in situ" with UV assistance. Depending on both the composition of the copolymers and the experimental conditions, either spherical or wormlike "stabilized polymeric micelles with a mixed shell" (SPMMS) were observed by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The SPMMS that contained PAA blocks in the shell were pH-sensitive, such that a reversible transition from well-dispersed SPMMS to precipitate could be promoted. In contrast, the SPMMS with a PEO/PDMAEMA mixed shell remained well-dispersed in the 2-11 pH range. Finally, SPMMS were successfully exploited as templates for the preparation of Ag nanoparticles (Ag NPs).

Research Center/Unit :

Center for Education and Research on Macromolecules (CERM)

Disciplines :

Materials science & engineering
Chemistry

Author, co-author :

Petrov, Petar; Institute of Polymers, Bulgarian Academy of Sciences, Sofia, Bulgaria

Tsvetanov, Christo B.; Institute of Polymers, Bulgarian Academy of Sciences, Sofia, Bulgaria

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

Language :

English

Title :

Stabilized mixed micelles with a temperature-responsive core and a functional shell

Publication date :

28 May 2009

Journal title :

Journal of Physical Chemistry B

ISSN :

1520-6106

eISSN :

1520-5207

Publisher :

American Chemical Society, Washington, United States - District of Columbia

Volume :

113

Issue :

Pages :

7527-7533

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://pubs.acs.org/doi/pdf/10.1021/jp901307d

Funders :

BAS - Bulgarian Academy of Sciences
F.R.S.-FNRS - Fonds de la Recherche Scientifique
CGRI - Commissariat général aux Relations internationales
BNSF - Bulgarian National Science Fund

Available on ORBi :

since 02 September 2011

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