Azobenzene polymer material and preparation method and applications thereof

A polymer material, azobenzene technology, applied in the field of photo-responsive polymer materials, can solve the problems of high energy consumption, high cost, environmental pollution, etc.

Active Publication Date: 2019-04-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the plastic or coating is damaged, or the adhesive material needs to be separated, there are currently two traditional methods: one is reheating and plasticizing, which is costly and consumes more energy; the other is using plastic at room temperature. solvent, the method is expensive and pollutes the environment

Method used

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  • Azobenzene polymer material and preparation method and applications thereof
  • Azobenzene polymer material and preparation method and applications thereof
  • Azobenzene polymer material and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The synthetic method of azobenzene polymer A:

[0046] 1) Dissolve 0.075mol of n-decylaniline in a mixture of 16mL of hydrochloric acid, 16g of ice and 110mL of acetone, slowly add dropwise to the above solution a mixed solution of 28mL of water, 28g of ice and 0.075mol of sodium nitrite, and the system is at -5 Stir at ~0°C for 30 minutes, then dissolve 0.075mol phenol in 2mol / L sodium hydroxide solution, add to the above system, stir and react for 2 hours under the condition of pH 9-10, stop the reaction, add hydrochloric acid for neutralization, and the reaction solution is pumped The crude product was obtained by filtering and washing with water. The crude product was recrystallized from ethanol after drying to obtain 4-(4-n-decylbenzene)azophenol.

[0047] 2) Dissolve 0.036 mol of the final product of step 1) in 40 mL of N,N-dimethylformamide, then add 0.036 mol of potassium carbonate, and stir at 30° C. for 30 min. Add 0.09mol potassium iodide and 0.039mol 6-chl...

Embodiment 2

[0051] The synthetic method of azobenzene polymer B:

[0052] 1) Dissolve 0.075mol of p-hexadecylaniline in a mixture of 16mL of hydrochloric acid, 16g of ice and 110mL of acetone, slowly add dropwise to the above solution a mixed solution of 28mL of water, 28g of ice and 0.075mol of sodium nitrite, and the system is in - Stir at 5-0°C for 30 minutes, then dissolve 0.075mol phenol in 2mol / L sodium hydroxide solution, add to the above system, stir and react for 2 hours under the condition of pH 9-10, then stop the reaction, add hydrochloric acid to neutralize, and the reaction solution is passed through The crude product was obtained by suction filtration and washing with water. The crude product was recrystallized from ethanol after drying to obtain 4-(4-n-hexadecylbenzene)azophenol.

[0053] 2) Dissolve 0.036 mol of the final product of step 1) in 40 mL of N,N-dimethylformamide, then add 0.036 mol of potassium carbonate, and stir at 30° C. for 30 min. Add 0.09mol potassium ...

Embodiment 3

[0057] Azobenzene polymers A and B realize self-healing methods: at room temperature, scratch the surface of the polymer solid sample, first use 365nm (30mW / cm 2 ) irradiate the damaged part with ultraviolet light for 10s to cause photoisomerization, solid-liquid transition, repair the damage, and then use 530nm (2mW / cm 2 ) irradiated with visible light to make the cis-azobenzene polymer return to the trans-solid, realizing self-healing. see details Figure 4 .

[0058] The solid-liquid transition time is shown in Table 2.

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Abstract

The invention provides an azobenzene polymer material which has a structure represented by formula I shown in the description. The azobenzene polymer can be isomerized under photoinduction, can be changed in glass-transition temperature, can produce a reversible solid-liquid transition at room temperature, and has and has repeatable self-repairing and surface repairing effects. Meanwhile, a trans-azobenzene polymer is solid, has strong adhesion and can bear loads. In contrast, a cis-azobenzene polymer is liquid and has weak adhesion, which means photoisomerization can cause load drop. Therefore, the azobenzene polymer provided by the invention can be used as a photoresponsive self-repairing material and a light-controlled reversible adhesive, and can solve problems a conventional thermoplastic polymer material in plastics, remodeling and damage repair of a coating, separation, recycling and adhesive surface repair of an adhesive and the like.

Description

technical field [0001] The invention relates to the technical field of photoresponsive polymer materials, in particular to an azobenzene polymer material and its preparation method and application. Background technique [0002] The glass transition temperature is an inherent property of amorphous polymer materials, and it is the boundary temperature range between the glassy state and the high elastic state of polymer materials. The size of the glass transition temperature directly affects the performance and process performance of the material. For general thermoplastic polymer materials, such as some plastics, coatings and thermoplastic adhesives, before they are formed, coated and bonded, they need to be heated above the glass transition temperature to enter a fluid state, and then cooled to form. If the plastic or coating is damaged, or the adhesive material needs to be separated, there are currently two traditional methods: one is reheating and plasticizing, which is co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/36C08L33/14C09J133/14
CPCC08F120/36C08L33/14C09J133/14
Inventor 吴思梁烁丰周影张振琳菲利普·魏斯
Owner UNIV OF SCI & TECH OF CHINA
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