Polymeric cross-linked surface treatments for controlling block copolymer orientation in thin films

Christopher M. Bates, Jeffrey R. Strahan, Logan J. Santos, Brennen K. Mueller, Benjamin O. Bamgbade, Jonathan A. Lee, Joshua M. Katzenstein, Christopher J. Ellison, C. Grant Willson

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55 Scopus citations

Abstract

The orientation of cylinder-forming poly(styrene-block-methyl methacrylate) [P(S-b-MMA)] was investigated on two sets of polymeric surface treatments: 10 para-substituted polystyrene derivatives with <10 mol % poly(4-vinylbenzyl azide) and a series of poly(styrene-random-4-vinylbenzyl azide) [P(S-r-VBzAz)] copolymers with 5-100 mol % poly(4-vinylbenzyl azide). The copolymers were spin-coated to form thin films and then cross-linked by heating. The resulting films exhibited a range of surface tensions from 21 to 45 dyn/cm. Perpendicular orientation of P(S-b-MMA) cylinders was achieved with poly(p-bromostyrene) and all the [P(S-r-VBzAz)] copolymer surface treatments, most notably the homopolymer of poly(4-vinylbenzyl azide). Films made from these simple copolymers are as effective as random terpolymer alignment layers commonly made from both block monomers and a cross-linkable monomer.

Original languageEnglish (US)
Pages (from-to)2000-2006
Number of pages7
JournalLangmuir
Volume27
Issue number5
DOIs
StatePublished - Mar 1 2011

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