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Micelle Formation in Block Copolymer/Homopolymer Blends: Comparison of Self-Consistent Field Theory with Experiment and Scaling Theory

Greenall, Martin J.; Buzza, D. Martin A.; McLeish, Thomas C.B.

Micelle Formation in Block Copolymer/Homopolymer Blends: Comparison of Self-Consistent Field Theory with Experiment and Scaling Theory Thumbnail


Authors

Martin J. Greenall

D. Martin A. Buzza

Thomas C.B. McLeish



Abstract

We present a self-consistent field theory (SCFT) study of spherical micelle formation in a blend of poly(styrene−butadiene) diblocks and homopolystyrene. The micelle core radii, corona thicknesses, and critical micelle concentrations are calculated as functions of the polymer molecular weights and the composition of the diblocks. We then make a parameter-free comparison of our results with an earlier scaling theory and X-ray scattering data. For the micelle core radii Rc, we find that SCFT reproduces the shape of the variation of Rc with different molecular parameters much more accurately compared to scaling theory, though, like scaling theory, it overestimates Rc by about 20−30%. For the corona thickness Lc, the accuracy of our SCFT results is at least as good as that of scaling theory. For copolymers with lighter core blocks, SCFT predictions for the critical micelle concentration improve over those of scaling theories by an order of magnitude. In the case of heavier core blocks, however, SCFT predicts the critical micelle concentration less well due to inaccuracies in the modeling of the bulk chemical potential. Overall, we find that SCFT gives a good description of spherical micelle formation and is generally more successful than scaling theory.

Citation

Greenall, M. J., Buzza, D. M. A., & McLeish, T. C. (2009). Micelle Formation in Block Copolymer/Homopolymer Blends: Comparison of Self-Consistent Field Theory with Experiment and Scaling Theory. Macromolecules, 42(15), 5873-5880. https://doi.org/10.1021/ma9000594

Journal Article Type Article
Publication Date Aug 1, 2009
Deposit Date Oct 31, 2011
Publicly Available Date Feb 12, 2013
Journal Macromolecules
Print ISSN 0024-9297
Electronic ISSN 1520-5835
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 42
Issue 15
Pages 5873-5880
DOI https://doi.org/10.1021/ma9000594
Public URL https://durham-repository.worktribe.com/output/1503135

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules copyright © American Chemical Society after peer review and technical editing by the publisher.






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