Journal Article

FZJ-2014-07140

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermoresponsive aggregation of PS-PNIPAM-PS triblock copolymer: A combined study of light scattering and small angle neutron scattering

Papagiannopoulos, A. (Corresponding Author) ; Zhao, J. ; Zhang, G. ; Pispas, S. ; Radulescu, A.FZJ*

2014
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.eurpolymj.2014.04.013

Abstract: The aggregate structure of a thermoresponsive polystyrene–b-poly(N-isopropylacrylamide)–b-polystyrene (PS–PNIPAM–PS) triblock copolymer was investigated as a function of temperature in aqueous solutions by the combination of small angle neutron scattering (SANS) and dynamic/static light scattering (LS). SANS shows that the system consists of spherical intermicellar aggregates which self-assemble into larger clusters either at temperatures below or above the lower critical solution temperature (LCST). Upon the solubility transition of PNIPAM the mass of the clusters increases significantly, whereas their size remains constant and the size of the intermicellar aggregates decreases. This picture is consistent with the LS data where the signature of the two entities in solution is observed. The combination of LS and SANS studies has presented a clearer scenario on the thermoresponsive aggregation behavior of the investigated PS–PNIPAM–PS triblock copolymer.

Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Key Technologies (1st) ; Soft Matter, Macromolecules, Complex fluids, Biophysics (1st) ; Nano Science and Technology (1st) ; Chemistry (2nd) ; Soft Condensed Matter (2nd) ; Materials Science (2nd)

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Contributing Institute(s):

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

Research Program(s):

1. 451 - Soft Matter Composites (POF2-451) (POF2-451)
2. 54G - JCNS (POF2-54G24) (POF2-54G24)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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