Polymer brushes for improvement of dry adhesion in biomimetic dry adhesives Online publication date: Mon, 15-Dec-2014
by Omer Javed Chaudhary; Emilio Calius; John V. Kennedy; Jadranka Travas-Sejdic
International Journal of Nanotechnology (IJNT), Vol. 11, No. 5/6/7/8, 2014
Abstract: Geckos' feet are extensively micro-structured, enabling geckos to adhere strongly to most surfaces and perform various manoeuvres even while upside down. Inspired by the structure of geckos' feet, a large number of biomimetic dry adhesives have been reported. Polymers brushes can offer a molecular scale attachment to surfaces; here we studied the effect of polymer brushes on adhesion. Atom transfer radical polymerisation (ATRP) was used to graft poly(butyl acrylate) brushes on a poly(dimethylsiloxane) (PDMS) surface using a surface-bound ATRP initiator. Growth of the polymer brushes was verified by ATR-FTIR spectroscopy. To study the effect of polymer brushes, the samples were tested for pull-off adhesion with and without the grafted chains. The polymer-grafted PDMS showed an increase in adhesion compared to unmodified PDMS. Results suggest that carefully selected polymer brushes will enhance the adhesion of microstructured biomimetic adhesives.
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