Probing Relief Terraces in Destabilized Thin Films of an Asymmetric Block Copolymer with Grazing-Incidence Small-Angle X-ray Scattering

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Title:	Probing Relief Terraces in Destabilized Thin Films of an Asymmetric Block Copolymer with Grazing-Incidence Small-Angle X-ray Scattering
Authors:	Sun,YS;Chien,SW;Liou,JY
Contributors:	化學工程與材料工程學系
Keywords:	ORDER-DISORDER TRANSITION;DIBLOCK COPOLYMERS;POLYMER-FILMS;PATTERN-FORMATION;SURFACE;HOMOPOLYMER;INTERFACES;BRUSHES;INSTABILITIES;POLYSTYRENE
Date:	2010
Issue Date:	2012-03-27 16:25:48 (UTC+8)
Publisher:	國立中央大學
Abstract:	X-ray scattering in a grazing-incidence geometry (GISAXS) was used to study relief microstructures in thin films of asymmetric polystyrene-block-poly(methyl methacrylate) P(S-b-MMA) that dewetted on SiO(x)/Si and PMMA-SiO(x)/Si after isothermal annealing at 210 degrees C for 12 h. The micro- and nanostructures of a P(S-b-MMA) film deposited on PS-SiO(x)/Si were studied for comparison. The diffuse scattering streaks observed at angles with respect to the film normal direction in the GISAXS patterns correlate with the formation of relief terraces comprising parallel PMMA cylinders packed within a PS matrix. The relief terraces reveal a facet-like wedge at the edge, resulting from partial wetting of the nonanchored P(S-b-MMA) top layer at contact angles in the range 4-6.5 degrees on a monolayer of autophobic P(S-b-MMA) brushes anchored onto SiO(x)/Si and PM MA-SiO(x)/Si.
Relation:	MACROMOLECULES
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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