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TitlePolymer brushes for improvement of dry adhesion in biomimetic dry adhesives
Publication TypeJournal Article
Year of Publication2014
AuthorsChaudhary, O.J., Calius E.P., Kennedy J.V., and Travas-Sejdic J.
JournalInternational Journal of Nanotechnology
Pagination636 - 644
Date Published2014
ISSN14757435 (ISSN)
KeywordsAdhesion, Atom transfer radical polymerisation (ATRP), Atom transfer radical polymerization, ATR-FT-IR spectroscopy, Biomimetic adhesives, Biomimetics, Dendrimers, Dry adhesion, Fourier transform infrared spectroscopy, Functional polymers, Grafting (chemical), Microchannels, PDMS, Polybutyl acrylate, Polydimethylsiloxane PDMS, Polymer brushes, Surfaces
AbstractGeckos' 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 polymerbrushes 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. Copyright © 2014 Inderscience Enterprises Ltd.

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