Reference : Temperature responsive complex coacervate core micelles with a PEO and PNIPAAm corona

	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/2268/66307

Title :	Temperature responsive complex coacervate core micelles with a PEO and PNIPAAm corona
Language :	English
Author, co-author :	Voets, Ilya K. [Wageningen UniVersity, The Netherlands > > Laboratory of Physical Chemistry and Colloid Science > >]
	Moll, Puck M. [Wageningen UniVersity, The Netherlands > > Laboratory of Physical Chemistry and Colloid Science > >]
	Aqil, Abdelhafid [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Jérôme, Christine [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Detrembleur, Christophe [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	de Waard, Pieter [Wageningen UniVersity, The Netherlands > > Wageningen NMR Centre > >]
	de Keizer, Arie [Wageningen UniVersity, The Netherlands > > Laboratory of Physical Chemistry and Colloid Science > >]
	Cohen Stuart, Martien A. [Wageningen UniVersity, The Netherlands > > Laboratory of Physical Chemistry and Colloid Science > >]
Publication date :	4-Sep-2008
Journal title :	Journal of Physical Chemistry B
Publisher :	American Chemical Society
Volume :	112
Issue/season :	35
Pages :	10833-10840
Audience :	International
ISSN :	1520-6106
e-ISSN :	1520-5207
City :	Washington
Country :	DC
Keywords :	[en] self-assembly in solution ; micelle ; stimuli responsive micelle
Abstract :	[en] In aqueous solutions at room temperature, poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP38-b-PEO211 and poly(acrylic acid)-block-poly(isopropyl acrylamide), PAA55-b-PNIPAAm88 spontaneously coassemble into micelles, consisting of a mixed P2MVP/PAA polyelectrolyte core and a PEO/PNIPAAm corona. These so-called complex coacervate core micelles (C3Ms), also known as polyion complex (PIC) micelles, block ionomer complexes (BIC), and interpolyelectrolyte complexes (IPEC), respond to changes in solution pH and ionic strength as their micellization is electrostatically driven. Furthermore, the PNIPAAm segments ensure temperature responsiveness as they exhibit lower critical solution temperature (LCST) behavior. Light scattering, two-dimensional 1H NMR nuclear Overhauser effect spectrometry, and cryogenic transmission electron microscopy experiments were carried out to investigate micellar structure and solution behavior at 1 mM NaNO3, T = 25, and 60 °C, that is, below and above the LCST of 32 °C. At T = 25 °C, C3Ms were observed for 7 < pH < 12 and NaNO3 concentrations below 105 mM. The PEO and PNIPAAm chains appear to be (randomly) mixed within the micellar corona. At T = 60 °C, onion-like complexes are formed, consisting of a PNIPAAm inner core, a mixed P2MVP/PAA complex coacervate shell, and a PEO corona.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	The Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) ; The EU Polyamphi/Marie Curie program (FP6-2002, proposal 505027) ; The SONS Eurocores program ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/66307
DOI :	10.1021/jp8014832
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/jp8014832

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