Article (Scientific journals)
Association behavior of thermo-responsive block copolymers based on poly(vinyl ethers)
Verdonck, Béatrice; Gohy, Jean-François; Khousakoun, Eric et al.
2005In Polymer, 46 (23), p. 9899-9907
Peer Reviewed verified by ORBi
 

Files


Full Text
Verdonck_B_2005_Polymer_46_23_9899.pdf
Author postprint (284.68 kB)
Download
Full Text Parts
Verdonck B 2005 Polymer 9899.pdf
Publisher postprint (308.25 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
stimuli-responsive polymer; temperature-responsive polymer
Abstract :
[en] Thermo-sensitive nanosized structures have been prepared in water from poly(methyl vinyl ether)-block-poly(isobutyl vinyl ether) (PMVE-b-PIBVE) block copolymers. The composition and the architecture (diblock and triblock architectures) of the PMVE-b-PIBVE copolymers have been varied. The investigated copolymers had an asymmetric composition with a major PMVE block, While the PIBVE blocks are hydrophobic, the PMVE blocks are hydrophilic at room temperature and become hydrophobic above their demixing temperature (around 36 degrees C) as a result of the lower critical solution temperature (LCST) behavior. At room temperature, the amphiphilic copolymers aggregate in water above a critical micelle concentration, which has been experimentally measured by hydrophobic dye solubilization. The hydrodynamic diameter of the structures formed above the cmc has been measured by dynamic light scattering (DLS) while their morphology has been studied by transmission electron microscopy (TEM). H-1 NMR measurements in D2O at room temperature reveal that the aggregates contain PIBVE insoluble regions surrounded by solvated PMVE chains. These investigations have shown that polydisperse spherical micelles are formed for asymmetric PMVE-b-PIBVE copolymers containing at least 9 IBVE units. For copolymers containing less IBVE units, loose aggregates are formed. Finally, the thermo-responsive, reversible properties of these structures have been investigated. Above the cloud point of the copolymers, the loose aggregates precipitate while the micelles form large spherical structures.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Verdonck, Béatrice;  University of Ghent, Belgium > Department of Organic Chemistry > Polymer Chemistry Research Group
Gohy, Jean-François;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Khousakoun, Eric;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ;  Université de Liège - ULiège > Centre d'études et de rech. sur les macromolécules (CERM)
Du Prez, Filip E.;  University of Ghent, Belgium > Department of Organic Chemistry > Polymer Chemistry Research Group
Language :
English
Title :
Association behavior of thermo-responsive block copolymers based on poly(vinyl ethers)
Publication date :
14 November 2005
Journal title :
Polymer
ISSN :
0032-3861
eISSN :
1873-2291
Publisher :
Elsevier Sci Ltd, Oxford, United Kingdom
Volume :
46
Issue :
23
Pages :
9899-9907
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
IWT - Agency for Innovation by Science and Technology
The ESF Program STIPOMAT
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Commentary :
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.
Available on ORBi :
since 12 February 2009

Statistics


Number of views
89 (11 by ULiège)
Number of downloads
291 (2 by ULiège)

Scopus citations®
 
38
Scopus citations®
without self-citations
34
OpenCitations
 
33

Bibliography


Similar publications



Contact ORBi