Effect of block length, polydispersity, and salt concentration on PEO−PDEAMA block copolymer structures in dilute solution

Adams, D. J. , Butler, M. F. and Weaver, A. C. (2006) Effect of block length, polydispersity, and salt concentration on PEO−PDEAMA block copolymer structures in dilute solution. Langmuir, 22(10), pp. 4534-4540. (doi:10.1021/la060192x) (PMID:16649760)

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Abstract

A series of poly(ethylene oxide)-block-poly(N,N-diethylaminoethyl methacrylate) (PEO−PDEAMA) block copolymers with relatively high polydispersity (1.36 < PDI < 1.96) have been prepared to determine the effect that polydispersity has on the self-assembly of amphiphilic block copolymers in dilute solution. Because monodisperse macroinitiators were used for the ATRP reactions, the polydispersity resides within the hydrophobic block. By adjusting the relative block lengths, spherical micelles, wormlike micelles, vesicles, or a precipitate is formed. Here, we show that relatively high polydispersity in the block copolymer does not preclude efficient self-assembly. We also discuss the effect of increasing the concentration of NaCl in the systems and show that this can result in a shift from one morphology to another. These shifts are reversible in some cases, but for PEO12−PDEAMA39, this method allows access to giant vesicles of between 500 nm and 1 μm in diameter.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Adams, Dave
Authors: Adams, D. J., Butler, M. F., and Weaver, A. C.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Langmuir
Publisher:American Chemical Society
ISSN:0743-7463
ISSN (Online):1520-5827
Published Online:15 April 2006

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