Journal Article

PreJuSER-15283

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The collapse transition and the segmental dynamics in concentrated micellar solutions of P(S-b-NIPAM) diblock copolymers

Adelsberger, J. ; Meier-Koll, A. ; Bivigou-Koumba, A. M. ; Busch, P.FZJ* ; Holderer, O.FZJ* ; Hellweg, T. ; Laschewsky, A. ; Müller-Buschbaum, P. ; Papadakis, C. M.

2011
Springer Berlin

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Please use a persistent id in citations: doi:10.1007/s00396-011-2382-3

Abstract: We investigate concentrated solutions of poly(styrene-b-N-isopropyl acrylamide) (P(S-b-NIPAM)) diblock copolymers in deuterated water (D2O). Both structural changes and the changes of the segmental dynamics occurring upon heating through the lower critical solution temperature (LCST) of PNIPAM are studied using small-angle neutron scattering and neutron spin-echo spectroscopy. The collapse of the micellar shell and the cluster formation of collapsed micelles at the LCST as well as an increase of the segmental diffusion coefficient after crossing the LCST are detected. Comparing to our recent results on a triblock copolymer P(S-b-NIPAM-b-S) [25], we observe that the collapse transition of P(S-b-NIPAM) is more complex and that the PNIPAM segmental dynamics are faster than in P(S-b-NIPAM-b-S).

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Key Technologies (1st) ; Soft Condensed Matter (2nd) ; J ; Block copolymers (auto) ; Responsive polymers (auto) ; Small-angle neutron scattering (auto) ; Neutron spin-echo spectroscopy (auto)

Note: We kindly acknowledge the given beam time by the Julich Centre for Neutron Science at FRM II. This work was supported by the DFG priority program SPP1259 "Intelligente Hydrogele" (Pa771/4, Mu1487/8, La611/7, He2995/2). A.M. Bivigou-Koumba gratefully acknowledges a personal grant from Deutscher Akademischer Austauschdienst (DAAD).

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Contributing Institute(s):

1. Neutronenstreuung (ICS-1)
2. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
3. Neutronenstreuung (JCNS-1)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. J-NSE: Neutron spin-echo spectrometer (NL2ao)
2. KWS-2: Small angle scattering diffractometer (NL3ao)

Appears in the scientific report 2011

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Database coverage:
JCR ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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