Title Swelling behaviour of PNIPAM-polyisoprene core-shell microgels at surface
Date 01.01.2011
Number 26222
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.
Publisher Colloid and Polymer Science
Citation Colloid and Polymer Science 289 (2011) 603-612
Authors Horecha, M. ; Senkovsky, V. ; Schneider, K. ; Kiriy, A. ; Stamm, M.
Tags 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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