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    Adhesion of Grafted-to Polyelectrolyte Brushes Functionalized with Calix[4]resorcinarene and Deposited as a Monolayer

    Year: 2020

    Journal: Langmuir, Volume 36, NOV 24, page 13843–13852

    Authors: Seddon, WD; Alfhaid, L; Dunbar, ADF; Geoghegan, M; Williams, NH

    Organizations: Engineering and Physical Sciences Research Council (ESPRC) through the Centre for Doctoral Training in Molecular Engineering of the University of SheffieldUK Research & Innovation (UKRI)Engineering & Physical Sciences Research Council (EPSRC); Engineering and Physical Sciences Research Council (ESPRC) through the Centre for Doctoral Training in Molecular Engineering of the University of Leeds; Ministry of Education of the Kingdom of Saudi Arabia

    Polyelectrolyte adhesives, either poly[2-(dimethylamino)ethyl methacrylate] or poly(methacrylic acid), functionalized with a surface-active calix[4]resorcinarene were grafted onto silicon wafers. Adhesion studies on these grafted-to brushes using polyelectrolyte hydrogels of opposite charge showed that it is the calix[4]resorcinarene, rather than adsorption of polyelectrolyte monomers, that adheres the brush to the silicon substrate. The adhesion measured was similar to that measured using polymers grafted from the surface, and was stronger than a control layer of poly(vinyl acetate) under the same test conditions. The limiting factor was determined to be adhesive failure at the hydrogel-brush interface, rather than the brush-silicon interface. Therefore, the adhesion has not been adversely affected by changing from a grafted-from to a grafted-to brush, demonstrating the possibility of a one-pot approach to creating switchable adhesives.
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