Paradiso Sean P, Delaney Kris T, García-Cervera Carlos J, Ceniceros Hector D, Fredrickson Glenn H
Department of Chemical Engineering, ‡Materials Research Laboratory, Materials Department, and §Department of Mathematics, University of California, Santa Barbara, California 93016, United States.
Department of Chemical Engineering, Materials Research Laboratory, Materials Department, and §Department of Mathematics, University of California, Santa Barbara, California 93016, United States.
ACS Macro Lett. 2014 Jan 21;3(1):16-20. doi: 10.1021/mz400572r. Epub 2013 Dec 12.
Solvent evaporation has proven to be a remarkably successful tool for directing self-assembly in block copolymers, yet the microscopic mechanisms, processing history dependence and macroscopic control parameters influencing pattern selection remain poorly understood. Here, we leverage dynamical field theory simulations to clarify how copolymer self-assembly proceeds during evaporation. We find that cylinders in the vertical orientation tend to form under modest evaporation rates and relatively weak segregation strengths, and link this behavior to nontrivial, morphology-dependent density correlations present at the ordering front.
溶剂蒸发已被证明是引导嵌段共聚物自组装的一种非常成功的方法，但影响图案选择的微观机制、对加工历史的依赖性和宏观控制参数仍知之甚少。在此，我们利用动态场论模拟来阐明共聚物在蒸发过程中的自组装过程。我们发现垂直取向的圆柱在适度的蒸发速率和相对较弱的相分离强度下易于形成，并将这种行为与有序前沿存在的、依赖于形态的非平凡密度相关性联系起来。
