Interfacial Design for Block Copolymer Thin Films

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• 作者：Michael J. Maher ; Christopher M. Bates ; Gregory Blachut ; Stephen Sirard ; Jeffrey L. Self ; Matthew C. Carlson ; Leon M. Dean ; Julia D. Cushen ; William J. Durand ; Colin O. Hayes ; Christopher J. Ellison ; C. Grant Willson
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：February 11, 2014
• 年：2014
• 卷：26
• 期：3
• 页码：1471-1479
• 全文大小：553K
• ISSN：1520-5002

文摘

Top coat design, coating, and optimization methodologies are introduced that facilitate the synthesis, application, and identification of neutral top coats for block copolymer (BP) thin films. Polymeric top coat composition, controlled via synthesis, determines interfacial wetting characteristics. Trimethylammonium salts of top coats improve solubility and coating uniformity. A 鈥渃onfined鈥?island and hole test conveniently establishes (non)preferential wetting at the top coat/BP interface, which depends upon top coat composition. The utility of these three concepts was demonstrated with two high-蠂, lamella-forming BPs, poly(styrene-block-4-trimethylsilylstyrene) (PS-b-PTMSS) having two periodicities L₀ = 18 and 22 nm and poly(styrene-block-methyltrimethylsilylmethacrylate) (PS-b-PTMSM) with L₀ = 15 nm. The combination of neutral top and bottom interfaces resulted in a perpendicular orientation of lamellae independent of BP film thickness (1鈥? L₀) when thermally annealed for 60 s or less.