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Dual frequency liquid crystal mixture with low critical conversion frequency

A frequency conversion and mixture technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve problems that limit the application of high-performance optoelectronic materials, affect the stability and life of devices, and achieve broad application value and market prospects, thermal stability The effect of good and wide liquid crystal phase temperature range

Active Publication Date: 2017-05-24
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the f of existing commercially available dual-frequency liquid crystal materials c Higher, requires a higher frequency drive, resulting in a large dielectric loss, affecting the stability and life of the device, limiting its application as a high-performance optoelectronic material

Method used

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  • Dual frequency liquid crystal mixture with low critical conversion frequency
  • Dual frequency liquid crystal mixture with low critical conversion frequency
  • Dual frequency liquid crystal mixture with low critical conversion frequency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Prepare the liquid crystal mixture according to the corresponding compounds and mass fractions in Table 1, heat to the isotropic state and oscillate, and sonicate for more than 1 hour to ensure that the components are evenly mixed. The obtained liquid crystal mixture was heated until clear and poured into parallel-oriented and vertically-oriented liquid crystal cells with a cell thickness of 10 um to test the dielectric constant value.

[0043] Gained mixture is nematic phase liquid crystal, and its performance parameter is as follows: f c =7.1, T I =106.3, T m ≤-20, Δn=0.12, η=88, Δε=1.9at 50Hz, Δε=-1.8at 10KHz.

[0044] The type and mass ratio of the components of the dual-frequency drive liquid crystal mixture in Table 1 Example 1

[0045]

[0046]

[0047]

Embodiment 2

[0049] Prepare the liquid crystal mixture according to the corresponding compounds and mass fractions in Table 2, heat to the isotropic state and oscillate, and sonicate for more than 1 hour to ensure that the components are evenly mixed. The obtained liquid crystal mixture was heated until clear and poured into parallel-oriented and vertically-oriented liquid crystal cells with a cell thickness of 10 um to test the dielectric constant value.

[0050] Gained mixture is nematic phase liquid crystal, and its performance parameter is as follows: f c =5.8, T I =103.2, T m ≤-20, Δn=0.10, η=76, Δε=2.8at 50Hz, Δε=-2.2at 10KHz.

[0051] The type and mass ratio of the components of the dual-frequency drive liquid crystal mixture of Table 2 Example 2

[0052]

[0053]

[0054]

Embodiment 3

[0056] Prepare the liquid crystal mixture according to the corresponding compounds and mass fractions in Table 3, heat to the isotropic state and oscillate, and sonicate for more than 1 hour to ensure that the components are evenly mixed. The obtained liquid crystal mixture was heated until clear and poured into parallel-oriented and vertically-oriented liquid crystal cells with a cell thickness of 10 um to test the dielectric constant value.

[0057] Gained mixture is nematic phase liquid crystal, and its performance parameter is as follows: f c =2.4, T I =96.2, T m ≤-20, Δn=0.13, η=41, Δε=4.6at 50Hz, Δε=-3.8at 10KHz.

[0058] The type and mass ratio of the components of the dual-frequency drive liquid crystal mixture of Table 3 Example 3

[0059]

[0060]

[0061]

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Abstract

The invention discloses a dual frequency liquid crystal mixture with a low critical conversion frequency. The mixture contains a first component and a second component. The first component includes one or more of compounds of a general formula I. The general formula I is shown in the description. The second component includes one or more of compounds of a general formula II. The general formula II is shown in the description. The dual frequency liquid crystal mixture in the invention has good performance of low critical conversion frequency, suitable viscosity, large dielectric anisotropy constant, wide liquid crystal temperature range and the like.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials. Specifically, the invention relates to a dual-frequency driving liquid crystal mixture with a low critical switching frequency. Background technique [0002] The dual frequency liquid crystal (Dual frequency liquid crystal) material has the characteristic that the positive and negative of the dielectric anisotropy can be changed with the external frequency. When there is no external frequency, the dielectric anisotropy value of the liquid crystal is positive; as the frequency of the applied AC electric field increases, the dielectric anisotropy can change from positive to negative; when the dielectric anisotropy is zero, it corresponds to The frequency value is the critical transition frequency (f c ), is an important index to measure the performance of dual-frequency liquid crystal. When the applied frequency is less than the critical frequency, the liquid crystal molecules ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/46
Inventor 杨槐王萌张兰英李辰悦胡威
Owner PEKING UNIV