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首页> 外文期刊>The Journal of Chemical Physics >Defect evolution and hydrodynamic effects in lamellar ordering processof two-dimensional quenched block copolymers
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Defect evolution and hydrodynamic effects in lamellar ordering processof two-dimensional quenched block copolymers

机译：二维淬火嵌段共聚物层状有序过程中的缺陷演化和流体力学效应

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摘要

The effects of hydrodynamic interactions on the lamellar ordering process for two-dimensionalquenched block copolymers in the presence of extended defects and the topological defectevolutions in lamellar ordering process are numerically investigated by means of a model based onlattice Boltzmann method and self-consistent field theory. By observing the evolution of the averagesize of domains, it is found that the domain growth is faster with stronger hydrodynamic effects. Themorphological patterns formed also appear different. To study the defect evolution, a defect densityis defined and is used to explore the defect evolutions in lamellar ordering process. Our simulationresults show that the hydrodynamics effects can reduce the density of defects. With our model, therelations between the Flory–Huggins interaction parameter x, the length of the polymer chains N,and the defect evolutions are studied. It is found that X~Nis an important parameter for defectevolutions. Furthermore, the evolution behavior of the defect densities and the average size ofdomains are compared and the differences are discussed.
机译：利用基于格子Boltzmann方法和自洽场理论的模型，数值研究了存在扩展缺陷和层状有序拓扑拓扑演化过程中二维淬火嵌段共聚物的水动力相互作用对层状有序化过程的影响。通过观察区域平均尺寸的演变，发现区域增长更快，并且具有更强的水动力效应。形成的形态学图案也表现出不同。为了研究缺陷的演变，定义了缺陷密度，并用于探索层状有序过程中的缺陷演变。我们的仿真结果表明，流体动力学效应可以降低缺陷的密度。利用我们的模型，研究了Flory-Huggins相互作用参数x，聚合物链长度N和缺陷演变之间的关系。发现X〜Nis是缺陷演化的重要参数。此外，比较了缺陷密度和区域平均尺寸的演化行为，并讨论了差异。

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