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Preparation method and application of azobenzene-based light energy storage phase change material

An alkoxyazobenzene storage and energy storage phase change technology, which is applied in the direction of materials, chemical instruments and methods for analysis and heat exchange through chemical reaction of materials, so as to increase the energy storage effect and improve the degree of isomerization. , the effect of accelerating the speed of heterogeneity

Pending Publication Date: 2020-10-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few research reports on the use of controllable solar fuels on textiles

Method used

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  • Preparation method and application of azobenzene-based light energy storage phase change material
  • Preparation method and application of azobenzene-based light energy storage phase change material
  • Preparation method and application of azobenzene-based light energy storage phase change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Synthesis of 4-butoxyazobenzene

[0031] Dissolve p-hydroxyazobenzene and 1-bromo-n-butane, potassium hydroxide and potassium iodide with N,N-dimethylformamide (DMF) and pour them into a three-necked flask at a molar ratio of 1:2:3: 1 was added, stirred and heated to 80°C, and reacted for 12h. The resulting solution was distilled off under reduced pressure to remove the solvent DMF, then extracted with dichloromethane, the organic layer was taken, evaporated under reduced pressure to remove dichloromethane. Finally, a eluent of petroleum ether: ethyl acetate = 7:1 (v / v) was used Pass through the column, take the middle layer, and remove the eluent by rotary evaporation to obtain the product 4-butoxyazobenzene.

[0032] Blend the 4-butoxyazobenzene obtained in the first step with paraffin wax at a molar ratio of 2:8, heat and stir at 70°C for 2 hours, and completely mix the two substances evenly.

Embodiment 2

[0034] Synthesis of 4-octyloxyazobenzene

[0035] Dissolve p-hydroxyazobenzene, 1-bromo-n-octane, anhydrous cesium carbonate and potassium iodide in N,N-dimethylformamide (DMF) and pour them into a three-necked flask, with a molar ratio of 1:2:3 :1 was added, stirred and heated to 80°C, and reacted for 8h. The resulting solution was distilled off under reduced pressure to remove the solvent DMF, then extracted with dichloromethane, the organic layer was taken, evaporated under reduced pressure to remove dichloromethane. Finally, the eluent of petroleum ether: ethyl acetate = 6:1 (v / v) was used Pass through the column, take the middle layer, and remove the eluent by rotary evaporation to obtain the product 4-octyloxyazobenzene.

[0036] The 4-octyloxyazobenzene and octadecanoic acid obtained in the first step were blended at a molar ratio of 5:5, heated and stirred at 80°C for 2 hours, and the two substances were completely mixed evenly.

Embodiment 3

[0038] Synthesis of 4-tetradecyloxyazobenzene

[0039] Dissolve p-hydroxyazobenzene and 1-bromo-n-tetradecane, anhydrous sodium carbonate and potassium iodide with N,N-dimethylformamide (DMF) and pour them into a three-necked flask at a molar ratio of 1:2.5: Add 3:2, stir and heat to 80°C, and react for 12h. The resulting solution was distilled off under reduced pressure to remove the solvent DMF, then extracted with dichloromethane, the organic layer was taken, evaporated under reduced pressure to remove dichloromethane. Finally, the eluent of petroleum ether: ethyl acetate = 6:1 (v / v) was used Pass through the column, take the middle layer, and remove the eluent by rotary evaporation to obtain the product 4-tetradecyloxyazobenzene.

[0040] Blend the 4-tetradecyloxyazobenzene obtained in the first step with tetradecyl alcohol in a molar ratio of 3:7, heat and stir at 80°C for 2 hours, and the two substances are completely mixed evenly.

[0041] Example 3

[0042] Synthesi...

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Abstract

The invention discloses a preparation method of an azobenzene-based light energy storage phase change material. The method comprises the following steps that: (1) preparing photoresponse azobenzene molecules: carrying out a reaction on 4-hydroxyazobenzene and 1-bromoalkane by using N, N-dimethylformamide as a solvent under an alkali and iodine-containing catalyst condition to obtain 4-alkoxy azobenzene energy storage molecules; and (2) preparing the azobenzene light energy storage phase change material: carrying out melt blending on the 4-alkoxy azobenzene energy storage molecules prepared inthe step (1) and an organic phase change material, fully stirring the molecules and the organic phase change material to obtain the azobenzene light energy storage phase change material. The phase change point of the phase change material decreases under ultraviolet irradiation, the phase change point of the phase change material rises under visible light irradiation, light response phase change control exists. The azobenzene light energy storage molecules have photochromic performance; the change of the color can indicate the change of an isomerism degree; and based on the corresponding relation, an energy storage state can be monitored, and the utilization efficiency of energy is improved.

Description

technical field [0001] The invention relates to a preparation method and application of an optical energy storage phase-change color-changing material, in particular to a preparation method and application of an azobenzene-based optical energy storage phase change material. Background technique [0002] The consumption of energy is increasing day by day, and at the same time the excessive exploitation and use of resources such as oil and coal, according to the "Paris Agreement" adopted by the United Nations Climate Change Conference (COP 21) in 2015, this agreement makes arrangements for the global response to climate change after 2020, Global emissions must be reduced by 60% by 2050. Therefore, it is necessary to find other sustainable energy sources to replace these non-renewable resources, and solar energy is a clean energy source that is almost inexhaustible. The International Energy Association (IEA) predicts that solar energy could provide more than 25% of the world's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/16C09K5/06C07C245/08C10L8/00G01N21/78
CPCC07C245/08C09K5/063C09K5/16C10L8/00G01N21/78
Inventor 王潮霞费良殷允杰
Owner JIANGNAN UNIV
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