Shear-induced sphere-to-cylinder transition in diblock copolymer thin films

Young Rae Hong, Douglas H. Adamson, Paul M. Chaikin, Richard A. Register

    Research output: Contribution to journalArticle

    Abstract

    Applying sufficiently strong shear to thin films of a sphere-forming polystyrene-polyisoprene diblock copolymer is shown to induce an order-order transition to cylinders. The transformation is not continuous or epitaxial, as the intercylinder spacing is ca. 10% greater than the spacing between close-packed lines of spheres. The transition is facilitated when the block copolymer has a composition which places it close to the "zero-field" (no shear) sphere/cylinder phase boundary; the shear-induced transformation is more difficult and less effective for a polymer further from this boundary. Applying a modest shear stress to a polymer close to the boundary distorts the hexagonal lattice formed by the spheres without forming cylinders; the mechanical anisotropy produced by this distortion is sufficient to permit a film containing only a single layer of spherical domains to align in shear.

    Original languageEnglish (US)
    Pages (from-to)1687-1691
    Number of pages5
    JournalSoft Matter
    Volume5
    Issue number8
    DOIs
    StatePublished - 2009

    Fingerprint

    Block copolymers
    copolymers
    shear
    Thin films
    thin films
    Polymers
    spacing
    polyisoprenes
    Polyisoprenes
    Polystyrenes
    polymers
    Phase boundaries
    block copolymers
    shear stress
    Shear stress
    polystyrene
    Anisotropy
    anisotropy
    Chemical analysis

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics

    Cite this

    Hong, Y. R., Adamson, D. H., Chaikin, P. M., & Register, R. A. (2009). Shear-induced sphere-to-cylinder transition in diblock copolymer thin films. Soft Matter, 5(8), 1687-1691. https://doi.org/10.1039/b820312a

    Shear-induced sphere-to-cylinder transition in diblock copolymer thin films. / Hong, Young Rae; Adamson, Douglas H.; Chaikin, Paul M.; Register, Richard A.

    In: Soft Matter, Vol. 5, No. 8, 2009, p. 1687-1691.

    Research output: Contribution to journalArticle

    Hong, YR, Adamson, DH, Chaikin, PM & Register, RA 2009, 'Shear-induced sphere-to-cylinder transition in diblock copolymer thin films', Soft Matter, vol. 5, no. 8, pp. 1687-1691. https://doi.org/10.1039/b820312a
    Hong, Young Rae ; Adamson, Douglas H. ; Chaikin, Paul M. ; Register, Richard A. / Shear-induced sphere-to-cylinder transition in diblock copolymer thin films. In: Soft Matter. 2009 ; Vol. 5, No. 8. pp. 1687-1691.
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