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Chiral menthyl liquid crystal oligomer film and preparation method thereof

A mint-based, oligomer technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of not being able to retain colors, etc., and achieve the effects of easy industrial production, high yield, and high thermal stability

Active Publication Date: 2021-08-17
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chiral menthol-based liquid crystal small molecule monomer does not retain its selective reflection color at room temperature

Method used

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  • Chiral menthyl liquid crystal oligomer film and preparation method thereof
  • Chiral menthyl liquid crystal oligomer film and preparation method thereof
  • Chiral menthyl liquid crystal oligomer film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1, preparing a chiral menthyl liquid crystal monomer.

[0043] Add 0.10 mol of adipic acid to a 150 mL single-necked bottle, add 30 mL of thionyl chloride, heat up to 64°C, heat to reflux for 6 hours, and distill under reduced pressure to obtain Intermediate 1 after the reaction is complete.

[0044] Move Intermediate 1 to a 250 mL three-neck flask, add 150 mL of chloroform as a solvent, heat to reflux, slowly add 0.10 mol of menthol chloroform solution dropwise, and heat to reflux for 6 hours. After the reaction is completed, filter under reduced pressure to obtain intermediate Body 2.

[0045] Add 0.12mol of p-hydroxybenzoic acid, 200mL of tetrahydrofuran and 0.1mol of pyridine into a 500mL three-neck flask, heat to reflux, slowly add the above intermediate 2 dropwise, and heat to reflux for 6h. After the reaction, cool and filter under reduced pressure, spin the filtrate to dryness, add dichloromethane, heat to reflux for 0.5h, cool and filter. The dichloromet...

Embodiment 2

[0067] Polymethyl hydrogen-containing linear siloxane PMHS, chiral menthyl liquid crystal monomer (M 1 ), (E)-1-(4-(2-(4-(allylcyclohexyl)vinyl)cyclohexyl)-4-methoxybenzene (M 2 ) was dissolved in 50mL xylene, stirred, and 0.8mL tetrahydrofuran solution of hexachloroplatinic acid (5mg·mL -1 ), N 2 Under protection, the temperature was raised to 65°C, and the reaction was carried out for 10 hours. After the reaction, the reaction solution was cooled to room temperature, poured into a beaker filled with about 100mL of methanol, left to stand overnight to precipitate a precipitate, filtered with suction, recrystallized from the filter cake with methanol, and dried to obtain a chiral menthyl liquid crystal oligomer, see Formula VI.

[0068]

[0069] Prepare O1-O8 series of chiral mint-based liquid crystal oligomers according to the above method, and the feed ratio is shown in Table 2 below:

[0070] Table 2 Feed ratio of chiral menthol-based liquid crystal oligomers

[007...

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Abstract

The invention discloses a chiral menthyl liquid crystal oligomer film and a preparation method thereof, the chiral menthyl liquid crystal oligomer is prepared by copolymerizing chiral menthyl liquid crystal monomers, achiral rod-like monomers and polymethyl hydrogen-containing linear siloxane in different molar ratios, the structural formula of the chiral menthyl liquid crystal oligomer is as shown in formula III, and the chiral menthyl liquid crystal oligomer film with bright color at room temperature is obtained by high-temperature quenching. The chiral menthyl liquid crystal oligomer film has high thermal stability and a wide liquid crystal interval, can retain the color of cholesteric liquid crystal at room temperature, presents bright color, and has wide application.

Description

technical field [0001] The invention relates to a chiral menthol-based liquid crystal oligomer film and a preparation method thereof, belonging to the technical field of optical materials. Background technique [0002] Chiral liquid crystals can form a helical structure due to the existence of chiral centers, so that chiral liquid crystal molecules have optical properties that ordinary liquid crystal molecules do not have, such as optical rotation, selective reflection, circular dichroism, etc., in nonlinear optics, It has potential application value in fast optical transfer switch, measurement of interface temperature, medicine, photosensitive ink, anti-counterfeiting label and color-changing clothing. This kind of chiral liquid crystal has been paid more and more attention due to its unique electro-optical properties. Menthol has three chiral centers, strong optical activity, relatively small volume and steric hindrance, and is an excellent chiral mesogen. However, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L83/06C08G77/38C09K19/38
CPCC08G77/045C08G77/38C08J5/18C08J2383/06C09K19/0403C09K19/3833C09K2019/0407
Inventor 罗丛丛么冰陈艳堵锡华贾迎钢周俊董黎明丁跃孙华
Owner XUZHOU UNIV OF TECH
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