The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, China, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.
J Chem Phys. 2011 Apr 14;134(14):144901. doi: 10.1063/1.3572266.
The ordering kinetics of directed assembly of cylinder-forming diblock copolymers is investigated by cell dynamics simulation of the time-dependent Ginzburg-Landau theory. The directing field, mimicking chemically or topologically patterned surfaces, is composed of a rectangular array of potential wells which are attractive to the minority blocks. The period of the templating fields is commensurate with the hexagonal lattice of the block copolymer domains. The ordering kinetics is described by the time evolution of the defect concentration, which reveals that the rectangular field of [1 m] for a given density multiplication has the best directing effect, and the reversed case of [m 1] has the worst. Compared with a hexagonal directing field, the rectangular field provides a better directing efficiency for a fixed high density multiplication. The difference of the directing effect can be understood by analyzing the ordering mechanisms in the two types of directing fields. The study reveals that the rectangular pattern is an alternative candidate to direct block copolymer assembly toward large-scale ordered domains.
通过对时变的金兹堡-朗道理论的单元动力学模拟，研究了柱状嵌段共聚物定向组装的有序动力学。导向场模拟化学或拓扑图案化表面，由矩形排列的势阱组成，这些势阱对少数嵌段有吸引力。模板场的周期与嵌段共聚物畴的六方晶格相一致。有序动力学通过缺陷浓度的时间演化来描述，该浓度揭示了对于给定的密度倍增，矩形场[1m]具有最佳的导向效果，而相反的[mn]情况则具有最差的导向效果。与六边形导向场相比，对于固定的高密度倍增，矩形场提供了更好的导向效率。通过分析两种导向场中的有序机制，可以理解导向效果的差异。该研究表明，矩形图案是一种替代的候选方案，可以将嵌段共聚物组装引导到大规模有序畴中。
