Photoinduced reversible solid-liquid conversion azobenzene high polymer material and application thereof in trenchless pipeline repair

A polymer material and solid-liquid transformation technology, applied in the field of pipeline repair, can solve the problems that cannot be repaired again, cross-linked polymers cannot be melted or dissolved, and achieve a good repair effect

Active Publication Date: 2022-04-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the lining pipe of this repair technology is damaged again, it cannot be repaired again because the traditional cross-linked polymer cannot be melted or dissolved.

Method used

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  • Photoinduced reversible solid-liquid conversion azobenzene high polymer material and application thereof in trenchless pipeline repair
  • Photoinduced reversible solid-liquid conversion azobenzene high polymer material and application thereof in trenchless pipeline repair
  • Photoinduced reversible solid-liquid conversion azobenzene high polymer material and application thereof in trenchless pipeline repair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the synthesis of polymerization monomer

[0033]

[0034] 1. 4-n-decylaniline (10g, 42.8mmol) was added to a mixed solution of dilute hydrochloric acid (11.0ml, ρ=1.18g / ml, 128.8mmol) and tetrahydrofuran (40ml), then placed in an ice-water bath. After stirring evenly, an aqueous solution of sodium nitrite (2.950 g, 42.8 mmol) was slowly added thereto, and mixed for 20 min. Phenol (4.6 mL, 1.071 g / ml, 49.5 mmol) was dissolved in an aqueous solution of sodium hydroxide (1.7 g, 43.0 mmol) and potassium carbonate (6.0 g, 43.4 mmol), and stirred for 20 min. The mixed solution containing 4-n-decylaniline was slowly added dropwise to the mixed solution containing phenol to react, the solution gradually changed from yellow to brown, and stirred at room temperature for 4 h. Neutralize to pH=6 with dilute hydrochloric acid, filter with suction, and wash with water three times to obtain a yellow-brown solid. Vacuum-dried at 45°C overnight, thermally recrystalliz...

Embodiment 2

[0038] Embodiment 2: Polymerization of azobenzene macromolecule

[0039] Dissolve 1,8-octanediol (1.65g, 11.3mmol) in 80mml of dichloromethane solvent, then add triethylamine (8.2mL, 58.9mmol) to it, stir well, and cool to 5°C in an ice-water bath Below; through the dropping funnel, add 2-bromoisobutyryl bromide (7ml, 56.5mmol) in this solution with the speed of 3s / drops, white mist is produced in the dropping process, and temperature rises slightly. After the dropwise addition, seal the mouth of the bottle with parafilm and continue to stir overnight for 12h. Extract three times with dichloromethane (lower layer) and saturated aqueous sodium chloride, and collect the organic phase. Dry with anhydrous sodium sulfate to remove water, filter, and remove solvent by rotary evaporation at 40°C. Pass through a silica gel column, and the eluent is petroleum ether:dichloromethane 100:0-4:1. Vacuum-dry at 45°C for 4 hours to obtain 1.8g of initiator.

[0040] Take the monomer 6-(4-((...

Embodiment 3

[0041] Example 3: Photo-induced solid-liquid transition of azobenzene polymers at the micron scale

[0042] At room temperature, take a small amount of azobenzene macromolecule (embodiment 2) solid sample on a smooth and clean glass slide, put the glass slide on the stage of the microscope, and use 365nm (5.5mW / cm 2 ) ultraviolet light irradiates the surface of the solid sample to cause photoisomerization, and after 15 minutes of irradiation, a complete solid-liquid transition is achieved. image 3 Liquefaction of trans solid samples under UV light irradiation is shown.

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Abstract

The invention discloses a photo-induced reversible solid-liquid conversion azobenzene high-molecular material and application thereof in trenchless pipeline repair, the photo-induced reversible solid-liquid conversion azobenzene high-molecular material has trans and cis configurations which are respectively shown as a formula I-(E) and a formula I-(Z), the trans-configuration formula I-(E) polymer is in a solid state at room temperature, the cis-configuration polymer is in a solid state at room temperature, and the cis-configuration polymer is in a solid state at room temperature. The cis-configuration high polymer shown as the formula I-(Z) is in a liquid state at room temperature. The azobenzene high polymer material can be used as a trenchless pipeline repair lining material, and a pipeline lining layer is obtained by spraying or infusing an azobenzene high polymer solution; when the pipeline is damaged, ultraviolet light is applied to the lining layer, the lining material can flow to fill cracks, and pipeline repairing is achieved.

Description

technical field [0001] The invention belongs to the technical field of pipeline repair, and in particular relates to a photoreversible solid-liquid transition azobenzene polymer material and its application in trenchless pipeline repair. Background technique [0002] In 2020, the length of urban drainage pipelines has exceeded 800,000 kilometers. If the pipelines are used for a long time, they will be damaged such as aging, corrosion, cracks and collapses, and they need to be repaired in time. Pipeline trenchless repair technology refers to the construction of laying, replacing and repairing various underground pipelines under the condition of excavating a very small part of the surface by using various geotechnical drilling equipment and technical means through guided and directional drilling. The new technology will not hinder traffic, destroy vegetation, and will not affect the normal operation of society, so it has high social and economic value. [0003] The existing t...

Claims

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Application Information

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IPC IPC(8): C08F120/36C08J3/28C08L33/14C07C245/08C09K3/12
Inventor 吴思李淑秀陈佳慧
Owner UNIV OF SCI & TECH OF CHINA
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