Journal Article

FZJ-2017-07497

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Block and Gradient Copoly(2-oxazoline) Micelles: Strikingly Different on the Inside

Filippov, S. K. (Corresponding author) ; Verbraeken, B. ; Konarev, P. V. ; Svergun, D. I. ; Angelov, B. ; Vishnevetskaya, N. S. ; Papadakis, C. M. ; Rogers, S. ; Radulescu, A.FZJ* ; Courtin, T. ; Martins, J. C. ; Starovoytova, L. ; Hruby, M. ; Stepanek, P. ; Kravchenko, V. S. ; Potemkin, I. I. ; Hoogenboom, R. (Corresponding author)

2017
ACS Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/16131  doi:10.1021/acs.jpclett.7b01588

Abstract: Herein, we provide a direct proof for differences in the micellar structure of amphiphilic diblock and gradient copolymers, thereby unambiguously demonstrating the influence of monomer distribution along the polymer chains on the micellization behavior. The internal structure of amphiphilic block and gradient co poly(2-oxazolines) based on the hydrophilic poly(2-methyl-2-oxazoline) (PMeOx) and the hydrophobic poly(2-phenyl-2-oxazoline) (PPhOx) was studied in water and water–ethanol mixtures by small-angle X-ray scattering (SAXS), small-angle neutron scattering (SANS), static and dynamic light scattering (SLS/DLS), and 1H NMR spectroscopy. Contrast matching SANS experiments revealed that block copolymers form micelles with a uniform density profile of the core. In contrast to popular assumption, the outer part of the core of the gradient copolymer micelles has a distinctly higher density than the middle of the core. We attribute the latter finding to back-folding of chains resulting from hydrophilic–hydrophobic interactions, leading to a new type of micelles that we refer to as micelles with a “bitterball-core” structure.

Keyword(s): Health and Life (1st) ; Biology (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. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)

Experiment(s):

1. KWS-2: Small angle scattering diffractometer (NL3ao)

Appears in the scientific report 2017

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Free to read ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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