Bis-diphenylacetylene liquid crystal compound containing alkene chain and related liquid crystal composition

By introducing alkenyl chains and specific side chain groups into bisphenylacetylene liquid crystal compounds, the problems of high melting point, poor compatibility and high viscosity of existing liquid crystal materials are solved, and liquid crystal materials with high birefringence, low viscosity and wide temperature zones are achieved, which are suitable for microwave and optical components.

CN119684181AActive Publication Date: 2025-03-25XIAN MODERN CHEM RES INST
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Patent Information

Application Number
CN202311231032.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-22
Publication Date
2025-03-25
Estimated Expiration
2043-09-22

AI Technical Summary

Technical Problem

The existing high birefringence liquid crystal materials have a high melting point, poor low temperature compatibility, and high viscosity due to the π-π action in molecules, which limits their application in microwave devices and optical components.

Method used

The bisdiphenylacetylene liquid crystal compound containing olefin chains is used, and its structure improves the temperature characteristics and compatibility of the liquid crystal phase change while reducing the rotational viscosity by introducing specific side chain groups.

Benefits of technology

The wide nematic liquid crystal temperature zone, low melting point, high definition highlights, high birefringence and low rotational viscosity of liquid crystal materials are achieved, improving its performance in microwave devices and optical components.

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Abstract

The invention discloses an alkene-chain-containing diphenylacetylene liquid crystal compound and a related liquid crystal composition, the structure of the liquid crystal compound is shown as a general formula I, in the formula I, R is hydrogen, fluorine and alkyl with 1-5 carbon atoms, and hydrogen on the carbon atoms can be substituted by fluorine; y is H, F, Cl, CN, NCS, CF3, OCF2H, OCF3, alkyl and alkoxy with the carbon atom number of 1-10, and alkenyl or alkenyloxy with the carbon atom number of 2-10; and X1-X3 are H, F, Cl, CH3, C2H5, CF3, OCF3 or CN. The liquid crystal composition comprises a liquid crystal compound with a structure shown in a general formula I. The biphenylacetylene liquid crystal compound containing the alkene chain has better liquid crystal phase change temperature characteristic, higher birefringence, lower rotary viscosity and higher dielectric adjustability. The material is especially suitable for preparation of microwave antennas and liquid crystal optical devices. # imgabs0 #
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