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Block copolymer for photochromic and thermochromic intelligent window, and preparation method and application thereof

A block copolymer and thermochromic technology, which is applied in windows/doors, shading screens, building structures, etc., can solve the problems of immune system damage, windows cannot be modulated by ultraviolet light, and material phase change, etc., to achieve broad development space, Good application prospect and simple construction method

Active Publication Date: 2021-09-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an environment with low temperature and strong ultraviolet rays, the window cannot modulate the ultraviolet rays because the temperature is not high enough to cause the phase transition of the material
However, excessive exposure of the human body to ultraviolet rays will cause damage to human eyes, skin and immune system due to photochemical reactions.

Method used

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  • Block copolymer for photochromic and thermochromic intelligent window, and preparation method and application thereof
  • Block copolymer for photochromic and thermochromic intelligent window, and preparation method and application thereof
  • Block copolymer for photochromic and thermochromic intelligent window, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method and application of a block copolymer for photochromic and thermochromic smart windows, comprising the following steps:

[0035] 1. Preparation of polymerized monomer methyl spiropyranyl ester (SPMA)

[0036] Weigh 2.61g of 2,3,3-trimethyl-3H indole and 2.46g of 2-bromoethanol and dissolve it in 20mL of acetonitrile, heat and reflux at 80°C for 24 hours under the protection of nitrogen atmosphere, and then recrystallize the product, namely substance a . Then dissolve it in 50mL with a concentration of 0.32mol L -1 KOH aqueous solution, stirred at room temperature for 1 h, and the product was obtained after extraction and distillation, which was substance b. Dissolve 3.29 g of 2-hydroxy-5-nitrobenzaldehyde and product substance b in 20 mL of absolute ethanol, heat and reflux at 80° C. for 3 h under a nitrogen atmosphere, and recrystallize after the reaction to obtain the product SPOH. Then SPOH was mixed with 5 mL of Et 3 N dissolved in 15 mL of d...

Embodiment 2

[0042] A preparation method and application of a block copolymer for photochromic and thermochromic smart windows, comprising the following steps:

[0043] 1. Preparation of polymerized monomer methyl spiropyranyl ester (SPMA)

[0044] Weighed 2.61g of 2,3,3-trimethyl-3H indole and 2.46g of 2-bromoethanol and dissolved it in 20mL of acetonitrile, heated to reflux at 80°C for 24h under the protection of nitrogen atmosphere, and then recrystallized the product, namely substance a. Then dissolve it in 50mL with a concentration of 0.32mol L -1 KOH aqueous solution, stirred at room temperature for 1 h, and the product was obtained after extraction and distillation, which was substance b. Dissolve 3.29g of 2-hydroxy-5-nitrobenzaldehyde and product substance d in 20mL of absolute ethanol, heat and reflux at 80°C for 3h under the protection of nitrogen atmosphere, and recrystallize after the reaction to obtain the product SPOH. Then SPOH was mixed with 5 mL of Et 3 N dissolved in 1...

Embodiment 3

[0050] A preparation method and application of a block copolymer for photochromic and thermochromic smart windows, comprising the following steps:

[0051] 1. Preparation of polymerized monomer naphtholpyran

[0052] Dissolve 7.5mL of trimethylsilylacetylene, 20mL of n-butyllithium and 9.1g of benzophenone in 50mL of tetrahydrofuran (THF) in an anhydrous and oxygen-free ice-water bath, and then purify to obtain the product, namely substance c. Dissolve 20g of 2,6-dihydroxynaphthalene and 24.3g of anhydrous potassium carbonate in 200mL of DMF, react at room temperature for 1 hour, then slowly add 15.6g of 2-bromoethanol in DMF solution dropwise, raise the temperature to 85°C, and react for 48 hours, Purification afforded the product, substance d. The synthesized substance c and substance d were dissolved in 40 mL of dichloromethane, 0.5 g of p-toluenesulfonic acid was added, and reacted at room temperature under nitrogen protection for 48 hours to obtain the product, namely su...

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Abstract

The invention provides a block copolymer for photochromic and thermochromic smart windows, and a preparation method and application thereof. The block copolymer contains a spiropyrane part for ultraviolet absorption and a temperature-sensitive polymer for thermochromic light modulation. The liquid thermal response intelligent window integrating the functions of ultraviolet shielding, sunlight adjustment and energy absorption and storage is successfully constructed by using the front section polymer. When the ambient temperature is lower than the lowest critical solution temperature (LCST) of the copolymer, the copolymer is dispersed and dissolved in water, has high transparency and higher sunlight transmittance, and can supply heat to a room in winter. When the ambient temperature rises above LCST, water molecules in the copolymer are extruded, and shrunk nanoparticles cause light scattering. No matter how the environment temperature is, as long as ultraviolet rays in sunlight reach a certain strength, the copolymer can absorb the ultraviolet rays through the photoisomerization process of spiropyrane.

Description

technical field [0001] The invention relates to the technical field of sunlight-adjusting smart window materials, in particular to a block copolymer for photochromic and thermochromic smart windows, its preparation method and application. Background technique [0002] In recent years, with the development of industrialization, urbanization, modernization and population growth, energy consumption worldwide has increased rapidly. According to statistics, in the global energy consumption, building energy consumption accounts for about 40% of the total energy consumption, surpassing the industrial and transportation fields. As the most important transparent component in the building structure, the window is the main channel connecting the indoor and outdoor of the building. The thermal insulation quality of the window directly affects the thermal insulation quality of the building. From the perspective of building thermal engineering, windows can be said to be the weakest part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F220/54C08F226/06E06B3/677E06B9/24
CPCC08F293/005C08F220/54C08F226/06E06B3/677E06B9/24C08F2438/01E06B2009/2405
Inventor 王海波田婧成煦杜宗良杜晓声
Owner SICHUAN UNIV
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