Journal Article

FZJ-2026-00037

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dynamics in Bridge-Rich Thermoresponsive Micellar Networks

Rosi, B. (Corresponding author)FZJ* ; Biehl, R.FZJ* ; Allgaier, J.FZJ* ; Schwärzer, K.FZJ* ; Pyckhout-Hintzen, W.FZJ* ; Czakkel, O. ; Prevost, S. ; de Souza, N. R. ; Holderer, O.FZJ* ; Förster, S.FZJ* ; Kruteva, M.FZJ*

2025
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.macromol.5c02197  doi:10.34734/FZJ-2026-00037

Abstract: Block copolymers containing thermoresponsive polyN-isopropyl acrylamide (PNIPAM) and a persistently hydrophobic block, like polystyrene (PS), form micellar gels in water when triblock (PS-PNIPAM-PS) are added as they interconnect micelles. Neutron scattering methods utilizing specific deuteration strategies allow one to address the structure and dynamics with a focus on PNIPAM bridging blocks. Triblocks increase the mechanical stability depending on the number of bridges formed. Small-angle neutron scattering (SANS) allows us to observe the arrangement of triblocks around the micellar core, and confirms that a large number of blocks is in bridging configuration. The dynamics of the bridges is Zimm-like, with significant changes due to the fixed ends, but presents internal friction like free PNIPAM. A characteristic modulation in the dynamics related to the geometrical arrangement is found. Side chains are mobile but strongly constrained by a much slower backbone. The theoretical approach derived herein can serve as a framework for describing other systems in which polymeric junctions play a significant role.

Keyword(s): Engineering, Industrial Materials and Processing (1st) ; Soft Condensed Matter (2nd)

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Contributing Institute(s):

1. Neutronenstreuung (JCNS-1)
2. JCNS-4 (JCNS-4)
3. JCNS-FRM-II (JCNS-FRM-II)
4. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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