Journal
MACROMOLECULES
Volume 51, Issue 17, Pages 6543-6551Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b01417
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Funding
- U.S. DOE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering (BES-MSE)
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
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We show that olefin metathesis can be used in an extremely simple process to rapidly alter the morphology of self-assembled poly(butadiene-b-ethylene oxide) (PB-PEO) dispersions in situ. The addition of a water-insoluble Hoveyda-Grubbs catalyst to aqueous assemblies of PB-PEO leads to degradation of the hydrophobic PB block by well-established metathesis pathways and a concomitant change in the composition of the block copolymer. This phenomenon drives morphological transitions characterized by rapidly decreasing sizes of the self-assembled aggregates, the ultimate extent of which is readily controlled by catalyst concentration. Exemplary cases are presented in which transitions from worm-like micelles to spherical micelles or from vesicles to worm-like micelles can be accomplished within minutes.
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