Perfluoroalkyl acyloxo biphenyl liquid crystal compound with terminal group containing aliphatic hydrocarbon chains

Abstract

The invention discloses a perfluoroalkyl acyloxo biphenyl liquid crystal compound with a terminal group containing an aliphatic hydrocarbon chain, which is shown in a structural general formula, wherein Rf is CF3(CF2)nCOO-; Rh is CyH2y+z(CO)mO-; n is equal to 6 to 8; m is equal to 0 or 1; y is equal to 3 to 10; z is equal to 1 or -1; and when z is equal to -1, the aliphatic hydrocarbon chain in the Rh is an unsaturated aliphatic hydrocarbon chain of which the tail end is a double-bond. The structure of the perfluoroalkyl acyloxo biphenyl liquid crystal compound with the terminal group containing the aliphatic hydrocarbon chain of the invention has no chiral atoms and a simple preparation method. In the liquid crystal compound of the invention, one end of biphenylyl contains the aliphatic hydrocarbon chain, while the other end is perfluoroalkyl acyloxy; and the liquid crystal compound has no other spacer groups between a perfluorocarbon chain and a liquid crystal core, structurally has no chiral atoms and simple preparation method, displays spirally smectic C phase, and has the characteristics of wide liquid crystal phase range, high stability and the like, and wide application prospect in the field of ferroelectric liquid crystal display.

Description

technical field The invention belongs to the field of liquid crystal materials, in particular to a perfluoroalkanoyloxybiphenyl liquid crystal compound containing aliphatic hydrocarbon chains in its terminal groups. Background technique Liquid crystal is an orientation-ordered fluid between isotropic liquid and anisotropic crystal. Changes in various external factors such as heat, electricity, magnetism, and light can change its structure and function. Fluorine-containing liquid crystals have the advantages of low viscosity, high resistivity, fast response speed, and high dielectric constant. They have been widely used in the display field, especially in ferroelectric liquid crystal displays, which have great application prospects. Compared with the traditional display mode, the ferroelectric liquid crystal display has the advantages of fast response speed and large viewing angle. In order for liquid crystals to have ferroelectricity, certain conditions must be met. One of ...

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Problems solved by technology

The above-mentioned compounds have complicated preparation process due to chiral atoms or spacer between the perfluorocarbon chain and the liquid crystal nucleus, which is unfavorable for industrial production.

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