In Situ Photocontrol of Block Copolymer Morphology during Dip-Coating of Thin Films

Jaana Vapaavuori, Josué Grosrenaud, Christian Pellerin, C. Geraldine Bazuin

    Research output: Contribution to journalArticleScientificpeer-review

    13 Citations (Scopus)


    We demonstrate a unique combination of simultaneous top-down and bottom-up control of the morphology of block copolymer films by application of in situ optical irradiation during dip-coating. A light-addressable and block-selective small molecule, 4-butyl-4′-hydroxyazobenzene (BHAB), is introduced into a diblock copolymer of polystyrene and poly(4-vinylpyridine) (PS-P4VP) of 28.4 wt % P4VP via supramolecular chemistry, notably by hydrogen bonding to P4VP. We show that the spherical morphology of thin films dip-coated from a THF solution at slow withdrawal rates in the dark convert to cylindrical morphology when dip-coated under illumination. This is attributed to volume expansion of the P4VP/BHAB phase due to trans-cis photoisomerization combined with a light-induced increase in BHAB uptake in the film. The demonstrated photocontrol highlights the potential of dip-coating as a scalable film preparation method that can be easily coupled with external stimuli to direct nanostructured self-assembly in the films as solvent evaporates.

    Original languageEnglish
    Pages (from-to)1158-1162
    Number of pages5
    JournalACS Macro Letters
    Issue number10
    Publication statusPublished - 20 Oct 2015
    Publication typeA1 Journal article-refereed

    ASJC Scopus subject areas

    • Organic Chemistry
    • Materials Chemistry
    • Polymers and Plastics
    • Inorganic Chemistry


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