On the mechanism of formation of vesicles from poly(ethylene oxide)-block-poly(caprolactone) copolymers

Adams, D. J. , Kitchen, C., Adams, S., Furzeland, S., Atkins, D., Schuetz, P., Fernyhough, C. M., Tzokova, N., Ryan, A. J. and Butler, M. F. (2009) On the mechanism of formation of vesicles from poly(ethylene oxide)-block-poly(caprolactone) copolymers. Soft Matter, 5(16), pp. 3086-3096. (doi:10.1039/b907628j)

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Abstract

Micelles, worm-like micelles and vesicles were prepared from poly(ethylene oxide)-b-poly(caprolactone) block copolymersvia a solvent switch method, and characterised by light scattering, X-ray scattering and cryo-transmission electron microscopy. The volume fraction of ethylene oxide, as the hydrophilic part in these polymers, determined the morphology in dilute solution, with spherical micelles, worm-like micelles, vesicles and precipitate being formed as the volume fraction decreased. The mechanism by which vesicles were formed in these systems during sequential dilution of the initial THF-rich solution with water was probed. It was shown that vesicles formed via a sequence of morphologies. The transitions between different self-assembled structures were followed using dynamic cryo-TEM. The behaviour of the PEO-b-PCL system was compared with the well-studied poly(acrylic acid)-b-poly(styrene) system; the behaviour was shown to differ in the final stage during the transition from worm-like micelles to vesicles.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Adams, Dave
Authors: Adams, D. J., Kitchen, C., Adams, S., Furzeland, S., Atkins, D., Schuetz, P., Fernyhough, C. M., Tzokova, N., Ryan, A. J., and Butler, M. F.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Soft Matter
Publisher:Royal Society of Chemistry
ISSN:1744-683X
ISSN (Online):1744-6848
Published Online:24 June 2009

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