The effects of asymmetric bent-shaped compounds on the temperature range and electro-optical performances of liquid crystalline blue phases
作者:Xin Wang、Wan-Li He、Zhou Yang、Dong Wang、Hui Cao、Zhi-Gang Zheng、Zhen Liu、Xiang Liu
DOI:10.1039/c6ra22704j
日期:——
Asymmetric bent-shaped molecules improve the temperature range and electro-optical performances of liquid crystalline blue phases.
不对称弯曲形分子可以提高液晶蓝相的温度范围和电光性能。
Properties and structural coloured film preparation of some chiral dopants derived from D-Isosorbide
作者:Shun Wang、Fengmei Fang、Yongmin Guo、Yi Li、Baozong Li、Yonggang Yang
DOI:10.1080/15421406.2020.1864571
日期:2021.6.13
Abstract A series of chiral dopants derived from D-isosorbide were synthesized. Some of them exhibita monotropicsmecticA phase. Comparison of the melting points of these chiral dopants, the decrease of them is mainly driven by the large entropy change. The helical twisting power (HTP) values of these chiral dopants with branched alkyl chains, lateral fluoro-substituents and double bonds are lower than
The invention consists of esters of anhydrosugar alcohols useful as plasticizers for polymeric compounds. Specifically, esters are formed of bis-anhydrohexitols, such as isosorbide, isomannide and isosiditide, and used as substitutes for the phthalate-based plasticizers in common use. The bis-anhydrohexitols are preferably produced from biological sources.
A series of N-benzoyl-N'-aryl thiourea derivatives bearing alkoxy groups in terminal positions have been prepared and investigated for their potential liquid crystals properties. It was found that only the compounds which have only two alkoxy chains show calamitic mesomorphic behaviour, with nematic, smectic A and C phases being displayed. The type and stability of these mesophases are greatly influenced by the alkyl chain length. Successive introduction of additional alkoxy groups on the benzoyl moiety led to a significant decrease of the clearing points and suppression of the mesogenic character. Using of branched alkyl chain, 2-ethyl-hexyl, instead of normal alkyl group, led to the disappearance of mesogenic behaviour together with the lowering of the clearing temperature. The influence of chain length and number of chains is discussed. (C) 2010 Elsevier B.V. All rights reserved.