title: Polymeric cross-linked surface treatments for controlling block copolymer orientation in thin films.
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.
authors.affiliation: Department of Chemistry, University of Texas at Austin, 1 University Station C0400, Austin, Texas 78712, United States.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Bates
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Strahan
authors.forename: Logan J
authors.initials: LJ
authors.lastname: Santos
authors.forename: Brennen K
authors.initials: BK
authors.lastname: Mueller
authors.forename: Benjamin O
authors.initials: BO
authors.lastname: Bamgbade
authors.forename: Jonathan A
authors.initials: JA
authors.lastname: Lee
authors.forename: Joshua M
authors.initials: JM
authors.lastname: Katzenstein
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Ellison
authors.forename: C Grant
authors.initials: CG
authors.lastname: Willson