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Swelling behaviour of PNIPAM-polyisoprene core-shell microgels at surface

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Abstract

Poly(N-isopropylacrylamide) (PNIPAM)-based microgels covered with hydrophobic but water-permeable shell were used for modification of a hydrophilic substrate with the aim to provide a ‘contraphilic’ wetting behaviour, namely, to make the surface more hydrophobic in water environment (polar medium) than in dry state in air (non-polar medium). Bottom-up approach has been applied for a stepwise preparation of a structured two-component surface. Loosely packed microgels self-organised into quasiperiodic arrays were chemically grafted to the hydrophilic, functionalised substrate. Afterwards, a surface-initiated polymerisation of isoprene was performed selectively from microgels making them hydrophobic. The surface was found to be water-sensitive, as observed by in situ AFM measurements. The surface fraction of the hydrophobic component increased from 13% in the dry state up to 25% in water due to swelling of the microgels. However, small contraphilic effect was recorded by water contact angle measurements because of a moderate lateral swelling of the core-shell microgels and due to a fast swelling of the microgels already upon the measurements.

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Acknowledgment

Financial support was provided by the Deutsche Forschungsgemeinschaft (STA 324/32-1 and SPP STA 324/32-2, 1259/1 “Intellegente Hydrogele”).

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  1. Department of Nanostructured Materials, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069, Dresden, Germany

    Marta Horecha, Volodymyr Senkovskyy, Konrad Schneider, Anton Kiriy & Manfred Stamm

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  1. Marta Horecha
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  2. Volodymyr Senkovskyy
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  3. Konrad Schneider
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  4. Anton Kiriy
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Correspondence to Volodymyr Senkovskyy or Anton Kiriy.

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Horecha, M., Senkovskyy, V., Schneider, K. et al. Swelling behaviour of PNIPAM-polyisoprene core-shell microgels at surface. Colloid Polym Sci 289, 603–612 (2011). https://doi.org/10.1007/s00396-010-2312-9

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  • DOI: https://doi.org/10.1007/s00396-010-2312-9

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