Phase behaviors in a binary mixture of diblock copolymers confined between two parallel walls

• Published in: Chinese physics B 2013-02, Vol.22 (2), p.372-380
• Main Author: 潘俊星 张进军 王宝凤 武海顺 孙敏娜
• Format: Article
• Language: English
• Subjects: Binary mixtures; Computer simulation; Confinement; Copolymers; Dynamic tests; Ginzburg-Landau理论; Monomers; Simulation; Walls; 二元混合物; 取向有序; 墙壁; 嵌段共聚物; 平行; 模型系统; 相行为
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/2/026401

The phase behaviors in a binary mixture of diblock copolymers confined between two parallel walls are investigated by using a cell dynamics simulation of the time-dependent Ginzburg-Landau theory.The morphological dependence of the wall-block interaction and the distance between walls（confinement degree） has been systematically studied,and the effect of repulsive interactions between different monomers is also discussed.It is interesting that multiple novel morphological transitions are observed by changing these factors,and various multilayered sandwich structures are formed in the mixture.Furthermore,the parametric dependence and physical reasons for the microdomain growth and orientational order transitions are discussed.From the simulation,we find that much richer morphologies can form in a binary mixture of diblock copolymers than those in a pure diblock copolymer.Our results provide an insight into the phase behaviors under parallel wall confinement and may provide guidance for experimentalists.This model system can also give a simple way to realize orientational order transition in soft materials through confinement.