Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (2): 133-138.DOI: 10.6023/A20090438 Previous Articles     Next Articles




  1. 1 复旦大学聚合物分子工程国家重点实验室 高分子科学系 上海 200438
  • 投稿日期:2020-09-22 发布日期:2020-11-10
  • 通讯作者: 李卫华
  • 作者简介:

    李卫华, 复旦大学高分子科学系教授, 1999、2004年在上海交通大学物理系获得学士、博士学位. 2004~2007年在加拿大St. Francis Xavier大学和McMaster大学从事博士后研究. 2007年加入复旦大学聚合物分子工程国家重点实验室.

    * E-mail: ; Tel.: 021-31243579
  • 基金资助:

“Bridge” Makes Differences to the Self-assembly of Block Copolymers

Weihua Li1,*()   

  1. 1 State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
  • Received:2020-09-22 Published:2020-11-10
  • Contact: Weihua Li
  • Supported by:
    National Natural Science Foundation of China(21925301)

To form “bridge” via the self-assembly of block copolymer provides a useful way for the fabrication of network structures of excellent mechanical properties, which is promising in applications. However, previous work has hardly paid attention to the impact of “bridge” on the self-assembly behavior of block copolymers. This account provides a review of a recent progress about the control of the self-assembly behaviors of block copolymers via the stretching degree of the bridging block. Accordingly, we have purposely designed BABCB linear multiblock copolymer. When BABCB copolymer self-assembles into binary mesocrystal structures (sphere or cylinder), the middle B-block connects a pair of A and C domains (“macromolecular atom” aggregated by blocks) naturally forming bridge. The stretching degree of the middle bridging B-block can be increased by reducing its length relative to the other two B-blocks, lowering the coordination numbers (CNs) of mesocrystal. Moreover, the asymmetry of CNs between A and C “macromolecular atoms” can be tuned by the asymmetry between the two end B-blocks. Abiding by the two principles, using self-consistent field theory (SCFT) we have predicted rich binary mesocrystals of equal and unequal CNs. Furthermore, we have extent the concept of “stretched bridge” into AB-type block copolymers. We have proposed the effect of combinatorial entropy to realize high-ratio bridging configurations in the self-assembled structures by AB-type block copolymers. By increasing the stretching degree of bridging blocks, we have successfully predicted nonclassical square array and graphene-like array of cylinders instead of the usual hexagonal array of cylinders. In future, it is hopeful to recast most of known atomic/ionic binary crystal structures or even beyond by considering topology and blending during the design of ABC-type block copolymers.

Key words: bridge, block copolymer, self-assembly, mesocrystal, self-consistent field theory