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Authors
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Horecha, M. ; Senkovsky, V. ; Schneider, K. ; Kiriy, A. ; Stamm, M.
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Title
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Swelling behaviour of PNIPAM-polyisoprene core-shell microgels at surface
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Date
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01.01.2011
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Number
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26222
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Abstract
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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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Publisher
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Colloid and Polymer Science
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Wikidata
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Citation
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Colloid and Polymer Science 289 (2011) 603-612
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DOI
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https://doi.org/10.1007/s00396-010-2312-9
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Tags
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microgel pnipam core-shell particles responsive surface switching effect angle neutron-scattering volume phase-transition hollow spheres polymer brushes n-isopropylacrylamide colloidal crystals emulsion droplets poly(n-isopropylacrylamide) particles films
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