Preparation method and application of photoresponsive organogel usable at 80°C

A light-responsive, gel-based technology, which is applied in the preparation of light-responsive organic gels with external cross-linking agents, without adding cross-linking agents, can solve the problems of lack of heat resistance, solvent volatility, etc., and achieve good light-responsive performance Effect

Active Publication Date: 2022-05-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a method for preparing organogel without adding a cross-linking agent and a method for preparing an organogel adding a cross-linking agent. The organogel prepared in this application can be used as a Photoresponsive gel material solves the problems of conventional gel materials such as solvent volatilization and lack of heat resistance, and still has good photoresponse performance at higher temperatures

Method used

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  • Preparation method and application of photoresponsive organogel usable at 80°C
  • Preparation method and application of photoresponsive organogel usable at 80°C
  • Preparation method and application of photoresponsive organogel usable at 80°C

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preparation example Construction

[0043] Aiming at the problems of volatile organic gels and lack of heat resistance in the prior art, this application uses the organic solvent 1,2-propanediol with a high boiling point and low volatility to replace the solvent-water in the traditional hydrogel, and the photoresponsive unit The ruthenium ligand and the benzonitrile-containing ligand were compounded into the gel network, and a light-responsive organic gel usable at 80°C was prepared. Further, the present application can directly form a gel without adding a cross-linking agent by adjusting the monomer concentration and the ratio of the ruthenium-containing complex monomer to the benzonitrile-containing monomer. The reversible transformation of gel-sol can be realized by switching, which can be used for material remodeling. At the same time, based on the color difference of the photoresponsive unit during ligand coordination and dissociation, the gel prepared by adding a cross-linking agent can realize reversible ...

Embodiment 1

[0077] Embodiment 1 The synthetic method of ruthenium-containing monomer A:

[0078] 1) Add 7mmol potassium hydroxide to 20mL dimethyl sulfoxide, stir and heat to 65°C, slowly add 7.4mmol ethanolamine dropwise to the above solution, stir the system at 65°C for 30min, then add 3.7mmol 4-chloro-2, Add 2,6'',2''-terpyridine to the above system, and stop the reaction after stirring at 65°C for 2 days; the reaction solution is cooled to room temperature, poured into 20ml of deionized water, the crude product is extracted with dichloromethane, anhydrous sulfuric acid Sodium drying, filtration, the reaction solution was filtered and washed with water to obtain a crude product, the oil phase was collected and the solvent was removed by rotary evaporation to obtain a crude product, and a light yellow solid was obtained by recrystallization from ethyl acetate;

[0079] 2) Dissolve 4.7mol of the final product of step 1) in 40mL of anhydrous dichloromethane, add 9.8mol of triethylamine un...

Embodiment 2

[0083] Embodiment 2 The synthetic method of benzonitrile-containing monomer B:

[0084] 1) Dissolve 10mmol 4-hydroxybenzonitrile, 10mmol potassium carbonate and 0.6mmol potassium iodide in 20ml N,N-dimethylformamide, stir the reaction solution at 110°C for 30min, then add 11mol 3-chloro-1-propane Alcohol was dissolved in 10ml of N,N-dimethylformamide, slowly added dropwise to the above system, stirred and reacted at 110°C for 24 hours, then the reaction was stopped, the reaction mixture was filtered, the residue was washed with dichloromethane, and the solvent was removed by a rotary evaporator to obtain crude Product, the crude product was purified by silica gel column chromatography after drying, and the eluent was petroleum ether and ethyl acetate to obtain a colorless oily liquid;

[0085] 2) Dissolve 5.64mmol of the final product of step 1) and 8.64mmol of triethylamine in 40mL of anhydrous dichloromethane, stir at room temperature for 10min, then slowly add 8.64mmol of a...

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Abstract

The invention provides a preparation method and application of a light-responsive organic gel that can be used at 80°C; the preparation method of the light-responsive gel without adding a crosslinking agent comprises the following steps: combining a ruthenium-containing monomer and a benzene-containing The cyanonitrile monomer is heated and reacted in 1,2-propylene glycol to obtain an initial mixed solution; the comonomer, initiator and 1,2-propylene glycol are mixed and then mixed with the initial mixed solution to obtain a prepolymer solution; the prepolymer The polymer solution is heated and polymerized in the dark to obtain a photoresponsive gel without adding a crosslinking agent. The present application also provides a preparation method of the photoresponsive gel with an external cross-linking agent. In this application, the reversible transformation of gel-sol can be realized by switching between light and dark heating conditions, which can be used for material remodeling. At the same time, based on the color difference of the photoresponsive unit during ligand coordination and dissociation, the gel prepared by adding a cross-linking agent can realize reversible writing and erasing of different patterns under the control of light and dark heating conditions, which is expected to be used in Information storage and anti-counterfeiting.

Description

technical field [0001] The invention relates to the technical field of photoresponsive polymer materials, in particular to a preparation method and application of photoresponsive organogel without adding a crosslinking agent or adding a crosslinking agent. Background technique [0002] Hydrogels have great potential in biomedical engineering and can be used in tissue engineering, health care, electronic skin, and soft robotics. However, the limitation of existing hydrogels is the lack of long-term stability. Water molecules cannot be stably fixed in the polymer network during application, making the hydrogels dehydrated and dry. At the same time, the high temperature dries the hydrogel, resulting in a huge change in the shape and mechanical properties of the hydrogel, which limits the scope of use and practical application scenarios of the hydrogel. Therefore, it is a challenge to design gel materials with long-term stability and heat resistance to maintain good performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/36C08F230/04C08F222/20
CPCC08F220/56C08F220/36C08F230/04C08F222/1063
Inventor 吴思杨霓黄云帅
Owner UNIV OF SCI & TECH OF CHINA
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