ABC型嵌段共聚物自组装理论研究进展

Recent progress in the study of the self-assembly of ABC block terpolymers

嵌段共聚物的自组装为功能性纳米材料的制备提供了一种重要途径. ABC型嵌段共聚物相比于AB型具有更大的参数空间,自组装行为也更加复杂.在实验所合成的三组分嵌段共聚物自组装体系中,已有多种复杂结构被发现,如螺旋超柱、编织图案等,但实验上比较难以直接阐明它们的形成机理.近年来,本课题组运用自洽场理论(SCFT)对ABC型嵌段共聚物自组装进行了系统的研究,聚焦探索其结构参数及拓扑结构对相行为的影响机制.本文介绍了本课题组关于“非受挫”和“受挫”两大类ABC型嵌段共聚物自组装的SCFT研究成果,揭示了一些非经典相的形成机理,并通过合理的分子设计预测了一系列新颖的有序结构.

The self-assembly of block copolymers provides an important platform for the preparation of functional nanomaterials.The ABC-type block terpolymers have considerably larger parameter space and exhibit more complicated self-assembly behaviors compared to the AB-type block copolymers.In the experimental researches,many kinds of complex nanostructures,e.g.,helical supercylindrical phases and knitting pattern,have been observed in the ABC triblock copolymers.However,it is rather challenging for experiments to probe into the formation mechanism of these structures.In recent years,our group have conducted systematic theoretical studies on the self-assembly of ABCtype block terpolymers using self-consistent field theory(SCFT),focusing on the controlling mechanisms of the architectural parameters and the topological architectures on the phase behaviors.This article summarizes our theoretical achievements on the self-assembly of both"non-frustrated"and"frustrated"ABC-type block terpolymers,which reveal the stabilizing mechanisms of some non-classical ordered phases and predict a series of stable novel structures via rational design of the architectures of block copolymers.