Phase Transitions of Polystyrene-b-poly(dimethylsiloxane) in Solvents of Varying Selectivity

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• 作者：Ting-Ya Lo ; Chia-Cheng Chao ; Rong-Ming Ho ; Prokopios Georgopanos ; Apostolos Avgeropoulos ; Edwin L. Thomas
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：September 24, 2013
• 年：2013
• 卷：46
• 期：18
• 页码：7513-7524
• 全文大小：817K
• 年卷期：v.46,no.18(September 24, 2013)
• ISSN：1520-5835

文摘

A simple method to create a variety of nanostructures via the self-assembly of a single composition silicon-containing block copolymer (BCP) is developed. By using selective solvents for the self-assembly of polystyrene-block-poly(dimethylsiloxane) (PS鈥揚DMS), the phase behavior of intrinsic BCP can be enriched due to the strong segregation of the PS鈥揚DMS enabling the diversity of the phase behavior of PS鈥揚DMS/solvent mixtures and clear-cut phase transitions upon solvent evaporation. The solution-state phase behaviors of the strong segregation BCP system in different solvents are systematically studied using temperature-resolved and time-resolved SAXS experiments. A variety of phases, such as sphere, cylinder, gyroid, lamellar phases and even inverted phases, can be acquired by simply tuning the selectivity of solvent for casting. Meanwhile, owing to the high etching contrast of the silicon-containing block versus the PS block, various nanostructured SiOC can be fabricated by using one-step oxidation. This approach suggests an easy way to create inorganic oxide nanostructures for various applications.