Mixed liquid crystal with huge electrothermal effect being controlled by light and preparation method of mixed liquid crystal

A technology of mixing liquid crystals and thermal effects, which is applied in the preparation of organic compounds, liquid crystal materials, carboxylic acid nitriles, etc., can solve problems such as no access, and achieve the effects of saving energy and protecting the environment

Active Publication Date: 2018-06-22
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of liquid crystal materials, including the giant electrocaloric effect, is of great significance for the application of liquid crystal materials in the fields of light, electricity, and heat. However, there is no way to control the electrothermal effect of liquid crystal materials currently used for refrigeration.

Method used

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  • Mixed liquid crystal with huge electrothermal effect being controlled by light and preparation method of mixed liquid crystal
  • Mixed liquid crystal with huge electrothermal effect being controlled by light and preparation method of mixed liquid crystal
  • Mixed liquid crystal with huge electrothermal effect being controlled by light and preparation method of mixed liquid crystal

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1, a method for preparing a mixed liquid crystal with light-regulated giant electrothermal effect, comprising the following steps:

[0026] (1) Add 9.8g of dodecylbromobenzene, 120mL of tetrahydrofuran, and 120mL of triethylamine to the first reaction vessel, sonicate for 40min under nitrogen protection, add 0.8g of triphenylphosphine palladium dichloride and 0.4g of iodide Cuprous, then add 6mL trimethylsilylacetylene, the reaction temperature is 80°C, and react for 8h under the protection of nitrogen. After stopping the reaction, remove tetrahydrofuran and triethylamine, dissolve in 50mL methanol and 100mL tetrahydrofuran, and place in the second reactor Then add 24g of potassium carbonate, stir at room temperature for 4h, then remove methanol and tetrahydrofuran, the crude product is purified by column chromatography, the developer is pure petroleum ether, and the first intermediate is obtained;

[0027] (2) Add 8g of p-cyanoaniline and 200mL of dichlorome...

Embodiment 2

[0031] Embodiment 2, a method for preparing a mixed liquid crystal with light-regulated giant electrothermal effect, comprising the following steps:

[0032] (1) Add 5.88g of pentylbromobenzene, 70mL of tetrahydrofuran, and 70mL of triethylamine to the first reaction vessel, sonicate for 40min under nitrogen protection, add 0.48g of triphenylphosphine palladium dichloride and 0.24g of cuprous iodide , then add 3mL trimethylsilylacetylene, the reaction temperature is 30°C, and react for 5h under the protection of nitrogen. After stopping the reaction, remove tetrahydrofuran and triethylamine, dissolve it in 60mL methanol and 120mL tetrahydrofuran, and place it in the second reactor Add 14 g of potassium carbonate, stir at room temperature for 8 hours, then remove methanol and tetrahydrofuran, and purify the crude product by column chromatography with pure petroleum ether as the developer to obtain the first intermediate;

[0033] (2) Add 4.8g of p-cyanoaniline and 120mL of dich...

Embodiment 3

[0037] Embodiment 3, a method for preparing a mixed liquid crystal with light-regulated giant electrothermal effect, comprising the following steps:

[0038] (1) Add 11.76g of butylbromobenzene, 140mL of tetrahydrofuran, and 140mL of triethylamine to the first reaction vessel, sonicate for 40min under nitrogen protection, add 0.96g of triphenylphosphine palladium dichloride and 0.48g of cuprous iodide , then add 2mL trimethylsilylacetylene, the reaction temperature is 60°C, and react for 6h under the protection of nitrogen. After stopping the reaction, remove tetrahydrofuran and triethylamine, dissolve it in 80mL methanol and 160mL tetrahydrofuran, and place it in the second reactor. Add 28g of potassium carbonate, stir at room temperature for 3 hours, then remove methanol and tetrahydrofuran, and purify the crude product by column chromatography, using pure petroleum ether as the developer to obtain the first intermediate;

[0039] (2) Add 9.6g of p-cyanobenzonitrile and 160m...

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Abstract

The invention provides a mixed liquid crystal with a huge electrothermal effect being controlled by light and a preparation method of the mixed liquid crystal. Azobenzene liquid crystal molecules withgood compatibility are added in a liquid crystal mixture, the obtained mixed liquid crystal has large dielectric anisotropy, can orient rapidly under the effect of an electric field, and can recoverto the original orientation behavior under the condition that the electric field is revoked, meanwhile, cis-trans isomerisation can happen on the mixed liquid crystal when the mixed liquid crystal isshined by ultraviolet lights, influences of corresponding properties can be obtained under the effect of the electric field intensity on the electrothermal effect, energy can be saved, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of cooling liquid crystal materials, in particular to a mixed liquid crystal with light-regulated giant electrothermal effect and a preparation method thereof. Background technique [0002] The most important application of electrocaloric effect is to use materials with electrocaloric effect to replace the steam condensation cycle mainly used in refrigeration at present. The available power of the compressor used in the steam condensation cycle is low, only 30% of the power is used for refrigeration, and the fluorine-based materials used are the main source of the greenhouse effect. [0003] As a kind of electrothermal material, liquid crystal material has a broad market prospect due to its high cooling efficiency and no pollution to the environment. With the rapid development of liquid crystal materials in recent decades, liquid crystal molecules with simple structures can no longer meet people's needs, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/65C07C255/50C07C253/30C07C15/48C07C1/32C07F7/08C09K19/06
CPCC07C15/48C07C255/50C07C255/65C09K19/062C09K2019/0437
Inventor 苗宗成沈文亮陈思雯王煜婷武萌萌刘中宇郭锟
Owner XIJING UNIV
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