Song Kai-Xu, Sun Zhao-Yan, An Li-Jia
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
J Chem Phys. 2009 Mar 28;130(12):124907. doi: 10.1063/1.3090483.
The effects of hydrodynamic interactions on the lamellar ordering process for two-dimensional quenched block copolymers in the presence of extended defects and the topological defect evolutions in lamellar ordering process are numerically investigated by means of a model based on lattice Boltzmann method and self-consistent field theory. By observing the evolution of the average size of domains, it is found that the domain growth is faster with stronger hydrodynamic effects. The morphological patterns formed also appear different. To study the defect evolution, a defect density is defined and is used to explore the defect evolutions in lamellar ordering process. Our simulation results show that the hydrodynamics effects can reduce the density of defects. With our model, the relations between the Flory-Huggins interaction parameter chi, the length of the polymer chains N, and the defect evolutions are studied. It is found that chiN is an important parameter for defect evolutions. Furthermore, the evolution behavior of the defect densities and the average size of domains are compared and the differences are discussed.
通过基于格子玻尔兹曼方法和自洽场理论的模型，对存在扩展缺陷时二维淬火嵌段共聚物层状有序化过程中流体动力学相互作用的影响以及层状有序化过程中的拓扑缺陷演化进行了数值研究。通过观察畴平均尺寸的演变，发现流体动力学效应越强，畴生长越快。形成的形态模式也有所不同。为了研究缺陷演化，定义了缺陷密度并用于探索层状有序化过程中的缺陷演化。我们的模拟结果表明，流体动力学效应可以降低缺陷密度。利用我们的模型，研究了弗洛里 - 哈金斯相互作用参数χ、聚合物链长度N与缺陷演化之间的关系。发现χN是缺陷演化的一个重要参数。此外，比较了缺陷密度和畴平均尺寸的演化行为并讨论了差异。
