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Issue 6, 2009
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Origins of toroidal micelle formation through charged triblock copolymer self-assembly

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Abstract

The toroidal micelle morphology has been produced by the self-assembly of poly(acrylic acid)-block-poly(methyl acrylate)-block-polystyrene (PAA-b-PMA-b-PS) triblock copolymervia interaction with organic diamines in mixed THF/water solution. Formation of toroidal, or ring-like, micelles was controlled by the ratio of THF to water, the chain length of the polystyrene block, the type and amount of diamino counterion as well as the solution preparation procedure. Two distinct mechanisms for toroidal micelle formation are proposed. Under the appropriate solution condition, toroids can be constructed either through elimination of high-energy spherical micelles and/or cylindrical micelle endcaps, or through perforation of disc-like micelles. Slow chain dynamics of triblock copolymers in solution associated with their high molecular weight plays an important role in toroidal micelle construction. Toroidal nanostructures were characterized with both transmission electron microscopy (TEM) and cryogenic transmission electron microscopy (cryo-TEM).

Graphical abstract: Origins of toroidal micelle formation through charged triblock copolymer self-assembly

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Publication details

The article was received on 08 Jul 2008, accepted on 26 Sep 2008 and first published on 24 Nov 2008


Article type: Paper
DOI: 10.1039/B811619A
Citation: Soft Matter, 2009,5, 1269-1278
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    Origins of toroidal micelle formation through charged triblock copolymer self-assembly

    H. Cui, Z. Chen, K. L. Wooley and D. J. Pochan, Soft Matter, 2009, 5, 1269
    DOI: 10.1039/B811619A

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