Photo-induced deformation liquid crystal macromolecular material and preparation method thereof

A technology of liquid crystal polymers and photodeformation, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as large internal stress, high shrinkage rate, and affecting material properties

Inactive Publication Date: 2007-09-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in past research work, the deformation rate of less than 10% limits the practical application of this effect
[0005] However, the main chain of azobenzene liquid crystal elastomers currently used by people is an acrylate structure, and it is urgent to develop materials with other types of main chain structures.
Moreover, the commonly used azobenzene liquid crystal elastomers are prepared by free radical thermal polymerization or photopolymerization. Due to the disadvantages of photoinitiated free radical polymerization, which are easily inhibited by oxygen, high shrinkage rate during curing, and large internal stress, etc., directly affect the properties of the material
In addition, the current photodeformation is limited to one-dimensional and two-dimensional directions, mainly manifested as stretching behavior, and the deformation rate is limited.
Many aspects of the above photodeformation of azobenzene liquid crystal elastomers need to be improved

Method used

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  • Photo-induced deformation liquid crystal macromolecular material and preparation method thereof
  • Photo-induced deformation liquid crystal macromolecular material and preparation method thereof
  • Photo-induced deformation liquid crystal macromolecular material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025]This example illustrates the synthesis of 4-ethoxy-4'-hydroxyazobenzene. First, 4-ethoxyaniline (10g, 73mmol) was dissolved in 150mL of hydrochloric acid (2mol / L), and the reaction solution was placed in a beaker and cooled to 0°C. Under stirring, 5.05g (73mmol) of A 100 mL aqueous solution of sodium nitrate was added dropwise to the reaction solution to generate a diazonium salt. Next, 6.9g (73mmol) of phenol and 8.8g (226mmol) of sodium hydroxide were pre-mixed in water, and then slowly added dropwise to the beaker, and the reaction was maintained at 0°C for 2h under stirring, and a yellow solid was precipitated. After the reaction, the precipitate was extracted with chloroform, the collected chloroform layer was dried with anhydrous magnesium sulfate, and the crude product obtained after evaporating chloroform was separated and purified by column chromatography filled with silica gel, and finally recrystallized to obtain 4-ethoxy -4'-Hydroxyazobenzene pure product. ...

Embodiment 2

[0027] This example illustrates the synthesis of 4-ethoxy-4'-glycidyl etheroxyazobenzene (E1AB2) monomer. First add 4.0g (17mmol) of 4-ethoxy-4'-hydroxyazobenzene pure product synthesized in Example 1 in the three-necked flask, then add 4.6g (50mmol) epichlorohydrin, then add 0.6g of phenyltributylammonium bromide and 6.8g (50mmol) of anhydrous potassium carbonate in 50mL of 2-butanone solution, after heating under reflux for 4h, the mixture was poured into 50mL of cold sodium hydroxide aqueous solution (1.0mol / L), followed by washing and extraction with chloroform, the collected chloroform layer was dried with anhydrous magnesium sulfate, and the crude product obtained after evaporating chloroform was separated and purified by column chromatography filled with silica gel, and finally recrystallized to obtain the pure product of E1AB2.

Embodiment 3

[0029] This example illustrates the synthesis of 4,4'-dihydroxyazobenzene. First, 4-aminophenol (10.0g, 92mmol) was dissolved in 180mL of hydrochloric acid (2mol / L), and the reaction solution was placed in a beaker and cooled to 0°C. Under stirring, 6.3g (92mmol) of nitrous acid was added to Sodium 100mL aqueous solution was added dropwise to the reaction solution to generate diazonium salt. Next, 8.6g (92mmol) of phenol and 11.0g (275mmol) of sodium hydroxide were pre-mixed in water, and then slowly added dropwise to the beaker, and the reaction was maintained at 0°C for 2h under stirring. The obtained mixture solution was extracted with chloroform, the collected chloroform layer was dried with anhydrous magnesium sulfate, and the crude product obtained after evaporating chloroform was separated and purified by column chromatography filled with silica gel, and finally recrystallized to obtain 4,4'-dihydroxy Pure azobenzene.

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Abstract

The invention discloses a new photo-induced deforming liquid crystal macromolecular material in liquid crystal macromolecular material technical domain, which is characterized by the following: choosing ethoxyl group as main chain and azo-benzene derivant as lateral chain with part crosslinking; choosing azo-benzene derivant of monocyclic oxygen group and bicycle oxygen group as monomer; mixing finite quantity light trigger and trigger of positive ion; putting into reactor; choosing proper reacting temperature; copolymerizing the light trigger positive ion under the function of wavelength light; getting the product. This material is a controlled photo-inducer flexural deformation material, which can be used to study driver and artificial muscle.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal polymer materials, and specifically relates to a new photodeformable liquid crystal polymer material (repeating units of ethoxy groups as the main chain, azobenzene derivatives as side chains, and partially cross-linked liquid crystal Polymers) and methods for their preparation. Background technique [0002] Photodeformable liquid crystal polymer material is a kind of intelligent deformation material controlled by light. The specific performance is: when the material is irradiated by light (usually ultraviolet light), the photoisomerization reaction occurs inside the material to cause the size change of the corresponding part. And through the synergistic effect between liquid crystal molecules and polymer chain segments, this microscopic change is transmitted to the molecular chain, so that the state of the molecular chain changes significantly, and the material exhibits photodeformation ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38
Inventor 俞燕蕾林里王蔚茹徐吉翔
Owner FUDAN UNIV
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