title: Inkjet-printed monolayers as platforms for tethered polymers.
abstract: Combining inkjet printing and atom-transfer radical polymerization (ATRP) provides a straightforward and versatile method for producing patterned polymer surfaces that may serve as platforms for a variety of applications. We report the use of drop-on-demand technology to print binary chemical gradients and simple patterns onto solid substrates and, by using surface-confined ATRP, amplify these patterns and gradients. Chemically graded monolayers prepared by inkjet printing dodecanethiol and backfilling with 11-mercaptoundecanol showed continuous changes in the water contact angle along the gradient. These samples also exhibited a distinct change in the intensity of methyl group and C-O stretching modes along the gradient. Graded or patterned polymer layers were produced by growing, with ATRP, tethered poly(methyl methacrylate) (PMMA) layers from gradient or patterned printed monolayers that contained a bromo-capped initiator. Atomic force microscopy and optical microscopy confirmed that the PMMA layers amplified the underlying printed initiator layer with remarkable fidelity.
authors.affiliation: Department of Chemical and Biomolecular Engineering and Center for Advanced Engineering Fibers and Films, Clemson University, Clemson, South Carolina 29634, USA.
authors.forename: Amit Y
authors.initials: AY
authors.lastname: Sankhe
authors.forename: Brandon D
authors.initials: BD
authors.lastname: Booth
authors.forename: Nathan J
authors.initials: NJ
authors.lastname: Wiker
authors.forename: S Michael
authors.initials: SM
authors.lastname: Kilbey
mesh_terms: D005609:Free Radicals / Q000737:chemistry; D018625:Microscopy, Atomic Force; D011108:Polymers / Q000737:chemistry*; D011327:Printing; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D005609:Free Radicals; D011108:Polymers