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Stable responsive diblock copolymer micelles for rheology control

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Van Ruymbeke, Evelyne [UCL] Pamvouxoglou, A. Vlassopoulos, D. Petekidis, G. Mountrichas, G. Pispas, S.

Stable block copolymer micelles with crosslinked rubbery cores serve as model soft colloids with tunable rheology. We demonstrate this by studying systematically two such micelles: one with a small polyisoprene core and long polystyrene hairs that dominate the response of the system, and another with a larger polybutadiene core and shorter polystyrene hairs, exhibiting colloid-like behavior. In addition to mass concentration, we use temperature as a means to vary the volume fraction and show that achieving the same volume fraction by these two different routes yields different macroscopic properties. The number density of the particles and osmotic pressure effects are the origin of the difference. The response of these micelles to varying solvent quality conditions has unexpected rheological consequences: remarkably, for concentrated colloid-like micelles, the viscosity exhibits a non-monotonic temperature dependence. This is attributed to particle swelling and changing particle interactions with temperature. It is thus evident that such systems provide ways for tailoring the flow of soft colloids.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2010
Language Anglais
Journal information "Soft Matter" - Vol. 6, no. 5, p. 881-891 (2010)
Peer reviewed yes
Publisher Royal Soc Chemistry (Cambridge)
issn 1744-683X
e-issn 1744-6848
Publication status Publié
Affiliation UCL - SST/IMCN - Institute of Condensed Matter and Nanosciences
Links
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Bibliographic reference Van Ruymbeke, Evelyne ; Pamvouxoglou, A. ; Vlassopoulos, D. ; Petekidis, G. ; Mountrichas, G. ; et. al. Stable responsive diblock copolymer micelles for rheology control. In: Soft Matter, Vol. 6, no. 5, p. 881-891 (2010)
Permanent URL http://hdl.handle.net/2078.1/34118