Derry, Matthew J., Mykhaylyk, Oleksandr O. and Armes, Steven P. (2017). A Vesicle-to-Worm Transition Provides a New High-Temperature Oil Thickening Mechanism. Angewandte Chemie, 56 (7), pp. 1746-1750.
Abstract
Diblock copolymer vesicles are prepared via RAFT dispersion polymerization directly in mineral oil. Such vesicles undergo a vesicle‐to‐worm transition on heating to 150 °C, as judged by TEM and SAXS. Variable‐temperature 1H NMR spectroscopy indicates that this transition is the result of surface plasticization of the membrane‐forming block by hot solvent, effectively increasing the volume fraction of the stabilizer block and so reducing the packing parameter for the copolymer chains. The rheological behavior of a 10 % w/w copolymer dispersion in mineral oil is strongly temperature‐dependent: the storage modulus increases by five orders of magnitude on heating above the critical gelation temperature of 135 °C, as the non‐interacting vesicles are converted into weakly interacting worms. SAXS studies indicate that, on average, three worms are formed per vesicle. Such vesicle‐to‐worm transitions offer an interesting new mechanism for the high‐temperature thickening of oils.
Publication DOI: | https://doi.org/10.1002/anie.201609365 |
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Divisions: | College of Engineering & Physical Sciences College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry |
Additional Information: | © 2017 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Publication ISSN: | 1521-3773 |
Last Modified: | 30 Sep 2024 12:18 |
Date Deposited: | 07 Jan 2020 15:09 |
Full Text Link: | |
Related URLs: |
https://onlinel ... /anie.201609365
(Publisher URL) |
PURE Output Type: | Article |
Published Date: | 2017-02-06 |
Published Online Date: | 2017-01-10 |
Accepted Date: | 2016-12-21 |
Authors: |
Derry, Matthew J.
(
0000-0001-5010-6725)
Mykhaylyk, Oleksandr O. Armes, Steven P. |