Yuan Jianan, Lu Xuemin, Li Qingxiang, Lü Zhiguo, Lu Qinghua
School of Chemical Science and Technology, Tongji University, Siping Road No. 1239, Shanghai, 200092, China.
Shanghai Key Lab of Electrical & Thermal Aging, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road No. 800, Shanghai, 200240, China.
Angew Chem Int Ed Engl. 2021 May 25;60(22):12308-12312. doi: 10.1002/anie.202101102. Epub 2021 Apr 19.
The spiral is a fundamental structure in nature and spiral structures with controllable handedness are of increasing interest in the design of new chiroptical materials. In this study, micrometer-scale spiral structures with reversible chirality were fabricated based on the assembly of a liquid crystalline block copolymer film assisted by enantiopure tartaric acid. Mechanistic insight revealed that the formation of the spiral structures was closely related to the liquid crystalline properties of the major phase of block copolymer under the action of chiral tartaric acid. The chiral spiral structures with controllable handedness were easily erased under ultraviolet light irradiation and restored via thermal annealing. This facile thermal treatment method provides guidance for fabrication of chiral micrometer-scale spiral structures with adjustable chiral properties.
螺旋是自然界中的一种基本结构，具有可控手性的螺旋结构在新型手性光学材料的设计中越来越受到关注。在本研究中，基于对映体纯酒石酸辅助的液晶嵌段共聚物薄膜的组装，制备了具有可逆手性的微米级螺旋结构。机理研究表明，螺旋结构的形成与手性酒石酸作用下嵌段共聚物主要相的液晶性质密切相关。具有可控手性的手性螺旋结构在紫外光照射下很容易被消除，并通过热退火恢复。这种简便的热处理方法为制备具有可调手性性质的手性微米级螺旋结构提供了指导。
