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Issue 16, 2009
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On the mechanism of formation of vesicles from poly(ethylene oxide)-block-poly(caprolactone) copolymers

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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.

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

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The article was received on 16 Apr 2009, accepted on 19 May 2009 and first published on 24 Jun 2009


Article type: Paper
DOI: 10.1039/B907628J
Citation: Soft Matter, 2009,5, 3086-3096

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

    D. J. Adams, C. Kitchen, S. Adams, S. Furzeland, D. Atkins, P. Schuetz, C. M. Fernyhough, N. Tzokova, A. J. Ryan and M. F. Butler, Soft Matter, 2009, 5, 3086
    DOI: 10.1039/B907628J

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