Liquid crystal monomer with reaction character and preparation method thereof

A technology of liquid crystal monomers and characteristics, applied in the field of liquid crystal compounds in the chemical field, can solve the problems of unstable product performance and easy adsorption of other ionic impurities, and achieve the effect of broadening the scope of application and increasing stability.

Inactive Publication Date: 2008-05-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defect that the liquid crystal monomer compound in the prior art is easy to adsorb other ionic impurities and the product performance is unstable, the present invention provides a liquid crystal monomer with reactive properties and a synthesis method thereof

Method used

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  • Liquid crystal monomer with reaction character and preparation method thereof
  • Liquid crystal monomer with reaction character and preparation method thereof
  • Liquid crystal monomer with reaction character and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The structural formula of the liquid crystal monomer with reactive properties in this embodiment is:

[0019]

[0020] where: n 1 =7,n 2 = 1, n 3 =2, alkenyloxy ortho-substituted.

[0021] The synthetic method of liquid crystal monomer 2-allyloxy-4-octyloxybenzoic acid p-propyl biphenyl ester:

[0022] (1) Ethyl 2,4-dihydroxybenzoate: Weigh 8g of 2,4-dihydroxybenzoic acid into a 250ml three-necked round-bottomed flask, then add 40ml of ethanol, heat it up to 40°C, and add 3ml of concentrated sulfuric acid dropwise , 30min to complete, heating to reflux. Stop the reaction after 10 hours, cool to room temperature, add anhydrous potassium carbonate to the three-necked flask to adjust the pH of the solution to 7, filter with water pump, wash the filter residue with 5ml of ethanol, then concentrate the filtrate, recover 35ml of solvent, and cool to obtain 9.99g of a reddish crude product , recrystallized with water, decolorized with activated carbon, and finally obta...

Embodiment 2

[0028] The structural formula of the liquid crystal monomer with reactive properties in this embodiment is:

[0029]

[0030] where: n 1 =9,n 2 = 3, n 3 =2, alkenyloxy ortho-substituted.

[0031] The synthetic method of liquid crystal monomer 2-pentyloxy-4-decyloxybenzoic acid p-propyl biphenyl ester:

[0032] (1) Ethyl 2,4-dihydroxybenzoate: Weigh 8g of 2,4-dihydroxybenzoic acid into a 250ml three-necked round-bottomed flask, then add 40ml of ethanol, heat it up to 40°C, and add 3ml of concentrated sulfuric acid dropwise , 30min to complete, heating to reflux. Stop the reaction after 10 hours, cool to room temperature, add anhydrous potassium carbonate to the three-necked flask to adjust the pH of the solution to 7, filter with water pump, wash the filter residue with 5ml of ethanol, then concentrate the filtrate, recover 35ml of solvent, and cool to obtain 9.99g of a reddish crude product , recrystallized with water, decolorized with activated carbon, and finally obt...

Embodiment 3

[0038] The structural formula of the liquid crystal monomer with reactive properties in this embodiment is:

[0039]

[0040] where: n 1 =7,n 2 = 1, n 3 =3, alkenyloxy meta-substituted.

[0041] The synthetic method of liquid crystal monomer 3-allyloxy-4-octyloxybenzoic acid p-butyl biphenyl ester:

[0042] (1) Ethyl 3,4-dihydroxybenzoate: Weigh 8g of 3,4-dihydroxybenzoic acid into a 250ml three-necked round-bottomed flask, then add 40ml of ethanol, heat it up to 40°C, and add 3ml of concentrated sulfuric acid dropwise , 30min to complete, heating to reflux. Stop the reaction after 10 hours, cool to room temperature, add anhydrous potassium carbonate to the three-necked flask to adjust the pH of the solution to 7, filter with water pump, wash the filter residue with 5ml of ethanol, then concentrate the filtrate, recover 35ml of solvent, and cool to obtain 9.9g of a reddish crude product , recrystallized with water, decolorized with activated carbon, and finally obtaine...

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Abstract

The invention relates to a liquid crystalline monomer with reaction property, and a relative preparation method. The compound structural formula is showed as above, wherein n1 is integer 6-12, n2 is integer 1-5, and n3 is integer 1-4, the substitution position of terminal olefine oxide group is at the ortho-position or para-position with respect to the benzene carbonic acid substrate. The inventive synthesis method comprises that uses dihydroxybenzoic acid as substrate to lead steric hindrance group into carboxyl group to generate ester, to be synthesized with alkyl halide to generate para-position ether, grafts alkylene on ortho-position or para-position hydroxyl group via alkoxylation, to be hydrolyzed into acid, to be esterified with alkyl substituted phenylphenol generated by Friedel-Crafts reaction and reduction, to generate the liquid crystalline monomer. The invention has reactive star polymer which can be polymerized or grafted on polymer chain, to a new type of liquid crystalline polymer or liquid crystalline elastomer connected as waist positions, with easily obtained raw materials, simple and safe operation, and wide application for thin plate display, artificial muscle, shape memory, biological medicine, and high strength material.

Description

(1) Technical field [0001] The invention relates to a liquid crystal compound in the field of chemistry, and is a liquid crystal monomer with reactive properties and a preparation method thereof. (2) Background technology [0002] Liquid crystals maintain order in the fluid state. Taking advantage of its anisotropic characteristics under light, electricity, magnetism and heat, liquid crystals are widely used in display, information, biomedicine and smart materials. Liquid crystal display is one of the most important uses of liquid crystal materials. It has experienced twisted nematic liquid crystal display (TN-LCD), super twisted nematic liquid crystal display (STN-LCD) and thin film transistor array drive display (TFT- LCD) three technical stages, because TFT-LCD has the characteristics of fast screen response, good contrast, high brightness, large viewing angle and rich colors, it overcomes the weaknesses of other types of display technologies and has become the most widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/708C09K19/10
Inventor 朱光明邓登宋斐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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