Journal Article

FZJ-2017-07369

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pressure-Dependence of Poly( N -isopropylacrylamide) Mesoglobule Formation in Aqueous Solution

Niebuur, B.-J. ; Claude, K.-L. ; Pinzek, S. ; Cariker, C. ; Raftopoulos, K. N. ; Pipich, V.FZJ* ; Appavou, M.-S.FZJ* ; Schulte, A. (Corresponding author) ; Papadakis, C. M. (Corresponding author)

2017
ACS Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsmacrolett.7b00563

Abstract: Above their cloud point, aqueous solutions of the thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM) form large mesoglobules. We have carried out very small-angle neutron scattering (VSANS with q = 0.21–2.3 × 10–3 Å–1) and Raman spectroscopy experiments on a 3 wt % PNIPAM solution in D2O at atmospheric and elevated pressures (up to 113 MPa). Raman spectroscopy reveals that, at high pressure, the polymer is less dehydrated upon crossing the cloud point. VSANS shows that the mesoglobules are significantly larger and contain more D2O than at atmospheric pressure. We conclude that the size of the mesoglobules and thus their growth process are closely related to the hydration state of PNIPAM.

Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Chemistry (2nd) ; Soft Condensed Matter (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)

Research Program(s):

1. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. KWS-3: Very small angle scattering diffractometer with focusing mirror (NL3auS)

Appears in the scientific report 2017

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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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