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Preparation method of photo-induced deformation liquid crystal polymer film based on helicene molecules, polymer film and device

A liquid crystal polymer, photodeformation technology, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as limiting molecular applications, and achieve the effect of improving performance, excellent performance, fast photoresponse curling and recovery characteristics

Active Publication Date: 2019-05-21
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to their excellent molecular dynamics properties, such molecules are currently mainly used for surface modification of materials and molecular self-assembly at the microscopic scale. It is still a huge challenge to introduce them into macroscopic systems to perform their functions, which greatly limits the development of such molecules. The application of molecules in actual production and life

Method used

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  • Preparation method of photo-induced deformation liquid crystal polymer film based on helicene molecules, polymer film and device
  • Preparation method of photo-induced deformation liquid crystal polymer film based on helicene molecules, polymer film and device
  • Preparation method of photo-induced deformation liquid crystal polymer film based on helicene molecules, polymer film and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example illustrates the synthesis of 4-(6'-propenyloxyhexyloxy)-4-methoxyphenol ester.

[0050] 1. Dissolve p-hydroxybenzoic acid (6.9g, 50mmol), potassium iodide (8.3g, 50mmol) and sodium hydroxide (5.6g, 140mmol) in 120ml deionized water, stir and heat to 75°C, after it is fully dissolved, 120ml of ethanol solution dissolved with 1-bromohexanol (10.8g, 60mmol) was added dropwise, the reaction temperature was raised to 90°C for 24h, the reaction product was poured into a large amount of deionized water acidified with hydrochloric acid (pH=3), and the white The precipitate was collected and recrystallized from ethanol to obtain 4-(6-hydroxyhexyloxy)benzoic acid.

[0051] 2. Dissolve 4-(6-hydroxyhexyloxy)benzoic acid (3.24g, 13.6mmol) in 40ml of dioxane, add N,N-dimethylaniline (2.47g, 20.4mmol), stir and heat to After 60°C, acryloyl chloride (1.85g, 20.4mmol) was slowly added dropwise and reacted for 2h; the reaction product was poured into deionized ice water aci...

Embodiment 2

[0054] This example illustrates the synthesis of 4-(6'-propenyloxyhexyloxy)-4-cyanophenolate.

[0055] 1. Dissolve p-hydroxybenzoic acid (6.9g, 50mmol), potassium iodide (8.3g, 50mmol) and sodium hydroxide (5.6g, 140mmol) in 120ml deionized water, stir and heat to 75°C, after it is fully dissolved, 120 ethanol solution dissolved with 1-bromohexanol (10.8g, 60mmol) was added dropwise, the reaction temperature was raised to 90°C for 24h, and the reaction product was poured into a large amount of deionized water acidified with hydrochloric acid (pH=3). The precipitate was collected and recrystallized from ethanol to obtain 4-(6-hydroxyhexyloxy)benzoic acid.

[0056] 2. Dissolve 4-(6-hydroxyhexyloxy)benzoic acid (3.24g, 13.6mmol) in 40ml of dioxane, add N,N-dimethylaniline (2.47g, 20.4mmol), stir and heat to After 60°C, acryloyl chloride (1.85g, 20.4mmol) was slowly added dropwise and reacted for two hours; the reaction product was poured into deionized ice water acidified with h...

Embodiment 3

[0059] This example illustrates the synthesis of 1,4-bis(4-(6'-propenyloxyhexyloxy)benzoyloxy)-2-toluene.

[0060] 1. Dissolve p-hydroxybenzoic acid (6.9g, 50mmol), potassium iodide (8.3g, 50mmol) and sodium hydroxide (5.6g, 140mmol) in 120ml deionized water, stir and heat to 75°C, after it is fully dissolved, 120 ethanol solution dissolved with 1-bromohexanol (10.8g, 60mmol) was added dropwise, the reaction temperature was raised to 90°C for 24h, and the reaction product was poured into a large amount of deionized water acidified with hydrochloric acid (pH=3). The precipitate was collected and recrystallized from ethanol to obtain 4-(6-hydroxyhexyloxy)benzoic acid.

[0061] 2. Dissolve 4-(6-hydroxyhexyloxy)benzoic acid (3.24g, 13.6mmol) in 40ml of dioxane, add N,N-dimethylaniline (2.47g, 20.4mmol), stir and heat to After 60°C, acryloyl chloride (1.85g, 20.4mmol) was slowly added dropwise and reacted for two hours; the reaction product was poured into deionized ice water acid...

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Abstract

The invention discloses a preparation method of a novel photo-induced deformation liquid crystal polymer film based on helicene molecules. The preparation method comprises the following steps: (1) mixing liquid crystal monomers and helicene molecules according to a mass ratio of (95 / 5) to (99 / 1), wherein the simple function group liquid crystal monomers and the bifunctional liquid crystal monomers are mixed according to a mass ratio of (80 / 15) to (1 / 94), the mass fraction of a free radical photo-initiator is 1.0 percent to 5.0 percent, and a total mass fraction of the photo-initiator, the liquid crystal monomers and the helicene molecules is 100 percent; uniformly mixing to obtain a mixed liquid crystal composite system with a wide nematic phase temperature range; (2) pouring the mixedliquid crystal composite system into a liquid crystal box to prepare a liquid crystal film, and controlling the thickness of the liquid crystal film to be 2 micrometers to 50 micrometers; and (3) polymerizing the mixed liquid crystal system in a nematic phase temperature range by virtue of visible light to obtain a film. The liquid crystal polymer film prepared by the invention presents unique curling movement by virtue of the excitation of ultraviolet rays, and has rapid response characteristic.

Description

technical field [0001] The invention belongs to the field of liquid crystal polymer materials, and specifically relates to a novel photodeformable liquid crystal polymer film material based on helicene molecules and its preparation method and device. It can return to the original shape after ultraviolet light, and the deformation mode and size can be adjusted by the intensity of ultraviolet light and the size of the film. It can be used to prepare a variety of smart devices, and has very broad application prospects in the fields of smart materials and artificial muscles. Background technique [0002] Photodeformable liquid crystal polymer material is a kind of material that can realize motion under the drive of light, and it can directly convert light energy into mechanical energy of the material. Light energy is a kind of clean energy, which has the advantages of simple and easy access, non-contact remote control, etc., and is easy to control in time and space, and is an id...

Claims

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Application Information

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IPC IPC(8): C08F220/30C08F220/36G02F1/1333C09K19/38
Inventor 杨槐兰若尘孙健
Owner PEKING UNIV
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