NDLI: Kinetics of aggregation in micellar solutions of thermoresponsive triblock copolymers – influence of concentration, start and target temperatures

Content Provider	Royal Society of Chemistry (RSC)
Author	Bivigou-Koumba, Achille M. Müller-Buschbaum, Peter Kulkarni, Amit Papadakis, Christine M. Adelsberger, Joseph Grillo, Isabelle Laschewsky, André Sharp, Melissa
Copyright Year	2013
Abstract	In aqueous solution, symmetric triblock copolymers with a thermoresponsive middle block and hydrophobic end blocks form flower-like core–shell micelles which collapse and aggregate upon heating through the cloud point (CP). The collapse of the micellar shell and the intermicellar aggregation are followed in situ and in real-time using time-resolved small-angle neutron scattering (SANS), while heating micellar solutions of a poly((styrene-d8)-b-(N-isopropyl acrylamide)-b-(styrene-d8)) triblock copolymer in D2O rapidly through their CP. The influence of polymer concentration as well as of the start and target temperatures is addressed. In all cases, the micellar collapse is very fast. The collapsed micelles immediately form small clusters which contain voids. They densify which slows down or even stops their growth. For low concentrations and target temperatures just above the CP, i.e. shallow temperature jumps, the subsequent growth of the clusters is described by diffusion-limited aggregation. In contrast, for higher concentrations and/or higher target temperatures, i.e. deep temperature jumps, intermicellar bridges dominate the growth. Eventually, in all cases, the clusters coagulate which results in macroscopic phase separation. For shallow temperature jumps, the cluster surfaces stay rough; whereas for deep temperature jumps, a concentration gradient develops at late stages. These results are important for the development of conditions for thermal switching in applications, e.g. for the use of thermoresponsive micellar systems for transport and delivery purposes.
Starting Page	1685
Ending Page	1699
Page Count	15
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c2sm27152d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cloud point Acrylamide Neutron diffraction Micelle Micellar solutions Polymer Hydrophobe Copolymer Diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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