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Stereocomplexation in novel degradable amphiphilic block copolymer micelles of poly(ethylene oxide) and poly(benzyl [alpha]-malate)

journal contribution
posted on 17.10.2016 by Ryan J. Pounder, Helen Willcock, Nga Sze Ieong, Rachel K. O'Reilly, Andrew P. Dove
The ring-opening polymerization of 5-(S)-[(benzyloxycarbonyl)methyl]-1,3- dioxolane-2,4-dione (l-malOCA) and 5-(R)-[(benzyloxycarbonyl)methyl]-1,3- dioxolane-2,4-dione (d-malOCA) from poly(ethylene oxide), PEO, macroinitiators using 4-methoxypyridine as the catalyst is reported. The self-assembly of these polymeric amphiphiles was shown to proceed most efficiently by a solvent switch methodology from THF to nanopure H 2O. Variation of the block lengths revealed that, as expected, larger block copolymers led to increased micelle dimensions as determined by dynamic light scattering (DLS) and transmission electron microscopy (TEM) and longer hydrophobic blocks led to increased micelle stabilities as determined by measurement of the critical micelle concentration (CMC). Furthermore, the self-assembly of equimolar mixtures of PEO-b-P(l-BMA) and PEO-b-P(d-BMA) resulted in micelles of increased sizes by both DLS and TEM analysis. These micelles also have a CMC value of 5.53 × 10 -3 g L -1 which is markedly lower than micelles formed from either enantiopure block copolymer (CMC values = 1.23 × 10 -2 g L -1 and 9.78 × 10 -3 g L -1 for micelles formed from PEO-b-P(l-BMA) and PEO-b-P(d-BMA) respectively).

Funding

We gratefully acknowledge the support provided by Research Councils UK (RCUK) for funding a fellowship to A.P.D. EPSRC (EP/G004897/1) is also acknowledged for funding a fellowship (R.O'R).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Soft Matter

Volume

7

Issue

22

Pages

10987 - 10993

Citation

POUNDER, R. ... et al., 2011. Stereocomplexation in novel degradable amphiphilic block copolymer micelles of poly(ethylene oxide) and poly(benzyl [alpha]-malate). Soft Matter, 7 (22), pp.10987-10993.

Publisher

© Royal Society of Chemistry

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2011

ISSN

1744-683X

eISSN

1744-6848

Language

en

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