This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/25051 in citations.
Please use the identifier: http://dx.doi.org/10.1021/acs.macromol.0c00263 in citations.
Thermoresponsive Molecular Brushes with Propylene Oxide/Ethylene Oxide Copolymer Side Chains in Aqueous Solution
Thermoresponsive Molecular Brushes with Propylene Oxide/Ethylene Oxide Copolymer Side Chains in Aqueous Solution
The thermoresponsive behavior of two molecular brushes having poly(propylene oxide)–poly(ethylene oxide) copolymer side chains is investigated in aqueous solution, where the side chains have longer contour lengths than the backbone. The brushes differ in the side-chain architecture; they are either...
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Personal Name(s): | Kang, Jia-Jhen |
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Jung, Florian A. / Ko, Chia-Hsin / Shehu, Kaltrina / Barnsley, Lester C. / Kohler, Fabian / Dietz, Hendrik / Zhao, Junpeng / Pispas, Stergios / Papadakis, Christine M. (Corresponding author) | |
Contributing Institute: |
Heinz Maier-Leibnitz Zentrum; MLZ Neutronenstreuung; JCNS-1 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Macromolecules, 53 (2020) 10, S. 4068 - 4081 |
Imprint: |
Washington, DC
Soc.
2020
|
DOI: |
10.1021/acs.macromol.0c00263 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) FRM II / MLZ |
Subject (ZB): | |
Link: |
Published on 2020-05-08. Available in OpenAccess from 2021-05-08. Published on 2020-05-08. Available in OpenAccess from 2021-05-08. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1021/acs.macromol.0c00263 in citations.
The thermoresponsive behavior of two molecular brushes having poly(propylene oxide)–poly(ethylene oxide) copolymer side chains is investigated in aqueous solution, where the side chains have longer contour lengths than the backbone. The brushes differ in the side-chain architecture; they are either a diblock (PbE) or a random copolymer (PrE). For both types of brushes, an overall rodlike shape at room temperature is revealed by cryo-electron microscopy. A polymer-rich central part and a water-rich outer part are identified by small-angle neutron scattering (SANS). Upon heating up to the cloud point, the shell of PbE weakly dehydrates, while the one of PrE severely dehydrates along with a cylinder-to-disk transformation. Moreover, the aggregates formed above the cloud points feature significantly different inner structures: PbE aggregates are composed of strongly interpenetrating brushes, while PrE aggregates consist of loosely packed brushes. These differences indicate the important role of the side-chain architecture in the thermal dehydration behavior and the associated structural changes. |