Abstract
Phase-transition and orientation of liquid crystal (LC) are two crucial factors for LC application. In this work, a long rod-like LC compound containing double azobenzene (M1) is successfully designed and synthesized. The combing technologies of nuclear magnetic resonance (1H NMR, 13C NMR) and Fourier transform infrared spectroscopy (FTIR) are used to identify the chemical structure of the molecule. Additionally, the polarized optical microscopy (POM), differential scanning calorimetry (DSC), and one-dimensional wide-angle X-ray diffraction (1D WAXD) experimental results show that M1 exhibits an ultrawide range of LC phases and a stable LC structure even at ultrahigh temperature, which indicates that this LC can be applied in some especial devices. Further, the compound M1 is used to tune the LC temperature range of the commercial LC 4-cyano-4′-pentylbiphenyl (5CB). A series of samples 1–7 are obtained through doping different contents of M1, which show different LC temperature ranges that are dependent on the composition ratio of M1 and 5CB. More interestingly, all resultant samples show spontaneous vertical orientation on the hydrophilic glass substrate. Meanwhile, due to the effect of azobenzene in the compound M1, a reversible transition between homeotropic to random orientation of the LC molecules is achieved when these LC cells are alternately exposed to UV irradiation and visible light, which implies that this material shows potential application in especial display and optical storage technologies.
Highlights
Liquid crystal (LC), as the most common and important material in modern society, shows tremendous applications in displays, optical devices, sensors, information storage, transmission, and so on [1,2,3,4,5,6]
The phase structure and structure and phase have been by polarizing optical microscopy phase transition havetransition been determined by determined polarizing optical microscopy (POM), differen(POM), differential scanning calorimetry (DSC), and one-dimensional wide-angle
4cessfully synthesized through multistep reactions according to Scheme 2, using 4-acetamacetamidophenol and
Summary
Liquid crystal (LC), as the most common and important material in modern society, shows tremendous applications in displays, optical devices, sensors, information storage, transmission, and so on [1,2,3,4,5,6]. The phase transitions of common rod-like LC molecules are controlled by thermal the phase transitions rod-like. The rod-like LC molecules containing azobenzene have been used process. The rod-like LC molecules containing azobenzene have been used for photofor photo-controlling phase transition and phase behavior [26,27,28]. The second requirement is that the LC molecules are able to be oriented through an through an external field, such as force [31], electricity [32], and magnetism [33]. Simiremote control accurate manipulation the realization of larly, the realization of photoalignment requires a specific structure for the LC molephotoalignment requires a specific structure for the LC molecules. A large amount of functional materials containing azobenzene, containing azobenzene, elastomers (LCEs), LC LC polymer networks (LCNs), like. This work, we prepared a novel rod-like molecule containing double (M1).structure
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