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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.
Author details: | Jan Weiss, Hans Wienk, Rolf Boelens, André LaschewskyORCiDGND |
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DOI: | https://doi.org/10.1002/macp.201300753 |
ISSN: | 1022-1352 |
ISSN: | 1521-3935 |
Title of parent work (English): | Macromolecular chemistry and physics |
Publisher: | Wiley-VCH |
Place of publishing: | Weinheim |
Publication type: | Article |
Language: | English |
Year of first publication: | 2014 |
Publication year: | 2014 |
Release date: | 2017/03/27 |
Tag: | block copolymers; polymer micelles; relaxation NMR spectroscopy; self-assembly; thermoresponsive materials |
Volume: | 215 |
Issue: | 9 |
Number of pages: | 5 |
First page: | 915 |
Last Page: | 919 |
Funding institution: | EC-FP7 project Bio-NMR [261863]; German Research Council (Deutsche Forschungsgemeinschaft DFG) [LA611/4] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Peer review: | Referiert |