Block copolymer micelles with an intermediate star-/flower-like structure studied by H-1 NMR relaxometry
- H-1 NMR relaxation is used to study the self-assembly of a double thermoresponsive diblock copolymer in dilute aqueous solution. Above the first transition temperature, at which aggregation into micellar structures is observed, the trimethylsilyl (TMS)-labeled end group attached to the shell-forming block shows a biphasic T-2 relaxation. The slow contribution reflects the TMS groups located at the periphery of the hydrophilic shell, in agreement with a star-like micelle. The fast T-2 contribution corresponds to the TMS groups, which fold back toward the hydrophobic core, reflecting a flower-like micelle. These results confirm the formation of block copolymer micelles of an intermediate nature (i.e., of partial flower-like and star-like character), in which a part of the TMS end groups folds back to the core due to hydrophobic interactions.
Verfasserangaben: | Jan Weiss, Hans Wienk, Rolf Boelens, André LaschewskyORCiDGND |
---|---|
DOI: | https://doi.org/10.1002/macp.201300753 |
ISSN: | 1022-1352 |
ISSN: | 1521-3935 |
Titel des übergeordneten Werks (Englisch): | Macromolecular chemistry and physics |
Verlag: | Wiley-VCH |
Verlagsort: | Weinheim |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2014 |
Erscheinungsjahr: | 2014 |
Datum der Freischaltung: | 27.03.2017 |
Freies Schlagwort / Tag: | block copolymers; polymer micelles; relaxation NMR spectroscopy; self-assembly; thermoresponsive materials |
Band: | 215 |
Ausgabe: | 9 |
Seitenanzahl: | 5 |
Erste Seite: | 915 |
Letzte Seite: | 919 |
Fördernde Institution: | EC-FP7 project Bio-NMR [261863]; German Research Council (Deutsche Forschungsgemeinschaft DFG) [LA611/4] |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Peer Review: | Referiert |