Ordering kinetics of block copolymers directed by periodic two-dimensional rectangular fields.
Ordering kinetics of block copolymers directed by periodic two-dimensional rectangular fields.
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DOI：
10.1063/1.3572266
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
Weihua Li;N. Xie;F. Qiu;Yuliang Yang;A. Shi
中科院分区：
文献类型：
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作者：
Weihua Li;N. Xie;F. Qiu;Yuliang Yang;A. Shi
用含时Ginzburg-Landau理论的胞动力学模拟方法研究了两嵌段共聚物定向组装的有序化动力学。模仿化学或拓扑图案化的表面的定向场由对少数块有吸引力的势威尔斯的矩形阵列组成。模板场的周期与嵌段共聚物域的六方晶格相当。用缺陷浓度随时间的演化描述了有序化动力学，结果表明，对于给定的密度倍增，[1 m]的矩形场具有最好的定向效应，而[m1]的反向场具有最差的定向效应.与六边形定向场相比，矩形定向场对于固定的高密度倍增提供了更好的定向效率。通过分析两种定向场的有序化机制，可以理解定向效应的差异。研究表明，矩形图案是一个替代的候选人，直接嵌段共聚物组装向大规模有序域。
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.