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
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Examples
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
Description
Claims
Application Information
- IPC
- C09K19/38
- Inventors
- 俞燕蕾; 林里