文献类型：期刊文献

英文题名：Moebius strips of chiral block copolymers

作者：Geng, Zhen[1];Xiong, Bijin[1];Wang, Liquan[2];Wang, Ke[1];Ren, Min[1];Zhang, Lianbin[1];Zhu, Jintao[1];Yang, Zhenzhong[3]

机构：[1]Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ, Wuhan 430074, Hubei, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]Tsinghua Univ, Dept Chem Engn, Inst Polymer Sci & Engn, Beijing 100084, Peoples R China

年份：2019

卷号：10

外文期刊名：NATURE COMMUNICATIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000484780000008)】；

基金：This work was funded by the National Natural Science Foundation of China (51525302 and 21802049), Key R&D Program of Ministry of Science and Technology (2018YFA0209200), Program for HUST Academic Frontier Youth Team (2015-01), and China Postdoctoral Science Foundation (2017M622403). Z. G. thanks M. L. Zhang at Tianma Microelectronics Co., Ltd. for fruitful discussion. We thank N. Zheng at South China University of Technology for WAXS measurements, and HUST Analytical and Testing Center and College of Life Sci. & Technol. for facilities.

语种：英文

摘要：The Moebius topology (twisted, single-sided strip) is intriguing because of its structural elegance and distinct properties. Here we report the generation of block copolymer Moebius strips via a fast self-assembly of chiral block copolymer polystyrene-block-poly(-lactide acid) (PS-b-PDLA) in tetrahydrofuran/water mixed solvents. The Moebius strip is formed by morphological evolution from large compound micelle (LCM) to spindle-like micelle (SLM) and then to toroid with a 180 degrees twist along the ring. Mechanism insight reveals that a subtle balance of crystallization of PDLA and microphase separation between PS and PDLA chains dominates the formation of Moebius strips. An intriguing helix-helix transition occurs during the chiral transfer from microphase to assemblies, which is driven by relaxation of the internal stress within SLM related to orientated stretching of PS chains. Mesoporous chiral channels can be generated within Moebius strips after removal of PDLA, which are interesting in chiral recognition, separation and asymmetric catalysis.