Kinetics of collapse transition and cluster formation in a thermoresponsive micellar solution of P(S-b-NIPAM-b-S) induced by a temperature jump

Joseph Adelsberger, Ezzeldin Metwalli, Alexander Diethert, Isabelle Grillo, Achille M. Bivigou-Koumba, André Laschewsky, Peter Müller-Buschbaum, Christine M. Papadakis

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Structural changes at the intra- as well as intermicellar level were induced by the LCST-type collapse transition of poly(N-isopropyl acrylamide) in ABA triblock copolymer micelles in water. The distinct process kinetics was followed in situ and in real-time using time-resolved small-angle neutron scattering (SANS), while a micellar solution of a triblock copolymer, consisting of two short deuterated polystyrene endblocks and a long thermoresponsive poly(N-isopropyl acrylamide) middle block, was heated rapidly above its cloud point. A very fast collapse together with a multistep aggregation behavior is observed. The findings of the transition occurring at several size and time levels may have implications for the design and application of such thermoresponsive self-assembled systems.

Original languageEnglish
Pages (from-to)254-259
Number of pages6
JournalMacromolecular Rapid Communications
Volume33
Issue number3
DOIs
StatePublished - 13 Feb 2012

Keywords

  • polymer physics
  • small-angle neutron scattering
  • thermoresponsive polymers
  • time-resolved measurements

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