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Issue 13, 2009
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“Micro-structure–macro-response” relationship in swollen block copolymer films

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We demonstrate the effect of confinement on the thickness-dependent swelling behavior of poly(styrene)-b-poly(2-vinylpyridine) diblock copolymer films as revealed by in situspectroscopic ellipsometry. “Microscopic” molecular confinement to the dimension smaller than the characteristic lamella spacing, as well as to the non-equilibrium microstructures limits the solvent up-take by the polymer film. The maximum degree of swelling (“macroscopic response”) is achieved for films with a starting thickness in a dry state hdr in the range of ∼one–two characteristic lamella dimension in bulk L0 and drops down according to ∼hdr−0.1 as the film thickness increases up to ∼μm scale (∼tens of L0). These findings bring novel fundamental insights into the stimuli-responsive behavior of confined soft matter.

Graphical abstract: “Micro-structure–macro-response” relationship in swollen block copolymer films

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Publication details

The article was received on 14 Apr 2009, accepted on 15 May 2009 and first published on 29 May 2009

Article type: Communication
DOI: 10.1039/B907332A
Soft Matter, 2009,5, 2534-2537

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    “Micro-structure–macro-response” relationship in swollen block copolymer films

    J. Gensel, C. Liedel, H. G. Schoberth and L. Tsarkova, Soft Matter, 2009, 5, 2534
    DOI: 10.1039/B907332A

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