Journal Article

FZJ-2020-01151

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Grazing Incidence Neutron Spin Echo Study of Poly(N-isopropylacrylamide) Brushes

Witte, J. (Corresponding author) ; Krause, P. ; Kyrey, T.FZJ* ; Dahl, A. M. ; Lutzki, J. ; Schmidt, B. V. K. J. ; Ganeva, M.FZJ* ; Koutsioubas, A.FZJ* ; Holderer, O.FZJ* ; Wellert, S.

2020
Am.Chem.Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/24543  doi:10.1021/acs.macromol.9b01247

Abstract: The structure and dynamic properties of poly(N-isopropylacrylamide) brushes at solid planar surfaces under good solvent conditions are studied. Polymer brushes with grafting densities in the concentrated and semidilute regime are prepared via surface-initiated atom transfer radical polymerization. The polymer brushes were removed from the substrates to determine the molar mass and molecular dispersity via size-exclusion chromatography to draw conclusions about the grafting density. The structure of the brushes was investigated with ellipsometry and neutron reflectometry measurements. We found an influence of the grafting density on the swelling properties of the poly(N-isopropylacrylamide) brushes. Furthermore, the brush dynamics at different neutron penetration depths was analyzed with neutron spin echo spectroscopy under grazing incidence. The evanescent intensity distribution was modeled with the BornAgain software package, which uses the distorted-wave Born approximation.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd)

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Contributing Institute(s):

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

Research Program(s):

1. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
3. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
4. DFG project 290879244 - Grenzflächennahe Dynamik nicht quervernetzter und quervernetzter Polymerarchitekturen auf festen planaren Oberflächen (290879244)

Experiment(s):

1. MARIA: Magnetic reflectometer with high incident angle (NL5N)
2. J-NSE: Neutron spin-echo spectrometer (NL2ao)

Appears in the scientific report 2020

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

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