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Issue 17, 2016
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Phase behavior of diblock copolymer/star-shaped polymer thin film mixtures

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Abstract

We investigated the phase behavior of thin film, thickness h ≈ 100 nm, mixtures of a polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) diblock copolymer with star-shaped polystyrene (SPS) molecules of varying functionalities f, where 4 ≤ f ≤ 64, and molecular weights per arm Marm. The miscibility of the system and the surface composition varied appreciably with Marm and f. For large values of Marm, regardless of f, the miscibility of the system was qualitatively similar to that of linear chain PS/PS-b-P2VP mixtures – the copolymer chains aggregate to form micelles, each composed of an inner P2VP core and PS corona, which preferentially segregate to the free surface. On the other hand, for large f and small Marm, SPS molecules preferentially resided at the free surface. Moreover, blends containing SPS molecules with the highest values of f and lowest values of Marm were phase separated. These observations are rationalized in terms of competing entropic interactions and the dependence of the surface tension of the star-shaped molecules on Marm and f.

Graphical abstract: Phase behavior of diblock copolymer/star-shaped polymer thin film mixtures

  • This article is part of the themed collection: Polymers
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Publication details

The article was received on 12 Mar 2016, accepted on 06 Apr 2016 and first published on 06 Apr 2016


Article type: Communication
DOI: 10.1039/C6SM00627B
Citation: Soft Matter, 2016,12, 3849-3853
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    Phase behavior of diblock copolymer/star-shaped polymer thin film mixtures

    J. Zhao, G. Sakellariou and P. F. Green, Soft Matter, 2016, 12, 3849
    DOI: 10.1039/C6SM00627B

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