Phase Transitions of Polystyrene-b-poly(dimethylsiloxane) in Solvents of Varying Selectivity
Phase Transitions of Polystyrene-b-poly(dimethylsiloxane) in Solvents of Varying Selectivity
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DOI：
10.1021/ma4013863
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发表时间：
2013-09-24
期刊：
影响因子：
5.5
通讯作者：
Thomas, Edwin L.
中科院分区：
文献类型：
--
作者：
Lo, Ting-Ya;Chao, Chia-Cheng;Thomas, Edwin L.
开发了一种通过单一成分的含硅嵌段共聚物（BCP）自组装来创建各种纳米结构的简单方法。通过使用选择性溶剂进行聚苯乙烯-嵌段-聚（二甲基硅氧烷）（PS-PDMS）的自组装，由于PS-PDMS的强烈偏析，使得PS-PDMS/溶剂混合物的相行为具有多样性，并且在溶剂蒸发时发生清晰的相变，因此可以丰富本征BCP的相行为。利用温度分辨和时间分辨SAXS实验系统地研究了强偏析BCP体系在不同溶剂中的溶液态相行为。通过简单地调整铸造溶剂的选择性，可以获得各种相，例如球体、圆柱体、螺旋体、层状相甚至反相。同时，由于含硅块与PS块的高蚀刻对比度，可以通过一步氧化制备各种纳米结构SiOC。这种方法提出了一种为各种应用创建无机氧化物纳米结构的简单方法。
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-PDMS), the phase behavior of intrinsic BCP can be enriched due to the strong segregation of the PS-PDMS enabling the diversity of the phase behavior of PS-PDMS/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.