Pentafluoropropylene ether liquid crystal compound as well as preparation method and application thereof

Abstract

The invention relates to a pentafluoropropylene ether liquid crystal compound as well as a preparation method and application thereof. The liquid crystal compound has a structural formula as shown in a formula I. The novel pentafluoropropylene ether liquid crystal compound provided by the invention is stable in structure and properties and has the characteristics of good intersolubility, good ultraviolet resistance, high charge retention rate and large dielectric anisotropy; after the liquid crystal compound is applied to a liquid crystal composition, the threshold voltage can be reduced, the delta n value of a system can be increased, the response speed can be increased, and the comprehensive performance of the liquid crystal composition can be improved. Therefore, the liquid crystal compound has huge application prospect and economic value. (The structural formula as shown in the Specification).

Description

technical field The invention relates to the field of liquid crystal materials, in particular to a pentafluoropropylene ether liquid crystal compound, a preparation method thereof, and an application of the liquid crystal compound. technical background In 1888, Austrian botanist Friedrich Reinitzer discovered liquid crystal materials. Since then, the research and application of liquid crystals have developed rapidly, especially after W. Helfrich and M. Schadt discovered the field effect of twisted nematic liquid crystals in 1971, making liquid crystal display technology be achieved. There are two drive methods for liquid crystal displays: passive matrix [also known as passive matrix (Passive Matrix, PM) or simple matrix] and active matrix [also known as active matrix (Active Matrix, AM)]. Active matrix liquid crystal displays can be divided into two types according to the type of active devices: two-terminal active matrix and three-terminal active matrix. The process of t...

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Problems solved by technology

The process of the two-terminal active mode is relatively simple, but the image quality is worse than that of the three-terminal active mode, and it is almost eliminated at present.

Patents such as WO2006 / 061966, WO2006 / 132015, JP2005-15775 and JP2007-277127 have involved derivatives containing pentafluoropropylene structure as liquid crystal compounds, but they all have small dielectric anisotropy, slow response speed, high rotational viscosity, etc. shortcoming

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