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Hydrogel system nano-scale phase change-based temperature-sensitive intelligent glass

A temperature-sensitive, smart glass technology, applied in the direction of glass/slag layered products, layered products, chemical instruments and methods, etc., can solve problems such as difficult restoration, poor environmental stability, and non-reusable smart glass. To achieve the effect of maintaining the stability of the environment

Active Publication Date: 2011-11-23
青岛至慧新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this kind of glass is kept at a temperature higher than the critical point for a long time, the temperature-sensitive polymer will precipitate and it is difficult to restore the original state, so that the smart glass does not have the function of repeated use.
Another temperature-sensitive smart glass is formed by placing network structure polymers prepared by polyisopropylacrylamide between glasses. However, polyisopropylacrylamide colloids will shrink when the temperature is higher than the critical temperature for a long time, and Pushes out absorbed moisture, making the glass less environmentally stable and difficult to reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] Example 1 Smart glass prepared by polyethylene glycol cross-linked network (A) and poly-N-isopropylacrylamide (B) (1)

[0043] Accurately weigh 10g (10mmol) of polyethylene glycol (Mn=1000) and dissolve it in 50ml of anhydrous pyridine. Ice bath, the temperature of the system was lowered to 0°C. Weigh 1.96g (12.5mmol) of methylxanthyl chloride and dissolve it in 10ml of anhydrous dichloromethane. Slowly add the methylxanthyl chloride dichloromethane solution into the polyethylene glycol pyridine solution dropwise using a constant pressure dropping funnel at 0°C (about 20 minutes). The reaction system was raised to room temperature, and reacted for 12 hours under magnetic stirring. The excess solvent was distilled off and washed with saturated NaHCO 3 and dichloromethane for multiple extractions. The organic layer was dried over anhydrous magnesium sulfate. After fully drying and filtering, the clear liquid was placed in a pear-shaped flask, and the excess solvent w...

example 2

[0049] Example 2 Smart glass prepared by polyethylene glycol cross-linked network (A) and poly-N-isopropylacrylamide (B) (2)

[0050] Accurately weigh 0.108g (0.95mmol) of N-isopropylacrylamide, 0.037g (0.214mmol) of pentamethyldiethylenetriamine (PMDETA), 0.011g (0.057mmol) of α-bromoiso Ethyl butyrate, 0.1 g (0.025 mmol) of azide-treated polyethylene glycol (Mn = 2000, 4000, 6000) and 0.04 g of pentaerythroxypropargyl ether were put together between glass plates. 6.0 ml of water was added, nitrogen gas was passed for 20 minutes, and 0.0154 g (0.107 mmol) of CuBr was added rapidly. It can be observed that the gel forms immediately after the addition of CuBr. Seal and react in an oil bath (T: 60°C 24h). After 24 hours the reaction was terminated by exposure to air. 5% EDTA solution to remove copper. Then, soak in the water solution until the water content is absorbed to 50%.

[0051] Optical parameters of biomimetic smart glass: the critical temperature of temperature res...

example 3

[0053] Example 3 Smart glass prepared by polyethylene glycol cross-linked network (A) and poly-N-isopropylacrylamide (B) (3)

[0054] Accurately weigh 0.0323g (0.285mmol) of N-isopropylacrylamide, 0.037g (0.214mmol) of pentamethyldiethylenetriamine (PMDETA), 0.011g (0.057mmol) of α-bromoiso Ethyl butyrate, 0.1g (0.025 mmol) azide-treated polyethylene glycol (Mn=2000, 4000, 6000) and partially alkynyl-substituted polyvinyl alcohol (molecular weight 5000) were put together between glass plates . Add 3.0 ml of water, blow nitrogen for 20 minutes, and quickly add 0.0154 g (0.107 mmol) of CuBr. It can be observed that the gel forms immediately after the addition of CuBr. Seal and react in an oil bath (T: 60°C 24h). After 24 hours the reaction was terminated by exposure to air. 5% EDTA solution to remove copper. Then, soak in the water solution until the water content is absorbed to 50%.

[0055] Optical parameters of the biomimetic smart glass: the transition temperature of t...

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Abstract

The invention discloses hydrogel system nano-scale phase change-based temperature-sensitive intelligent glass. The intelligent glass can produce a transition between a transparent appearance and an opaque appearance at a critical temperature. The intelligent glass is composed of glass sheets and temperature responsive hydrogel with an interpenetrating network structure, wherein the hydrogel is arranged between two of the glass sheets at least. The hydrogel is composed of a water-soluble cross-linked polymer network, temperature responsive polymers and water or inorganic salt aqueous solution, wherein the temperature responsive polymers run through the water-soluble cross-linked polymer network. The hydrogel can form a homogeneous system at a temperature below a critical temperature, and the temperature responsive polymers and the water-soluble cross-linked polymer network carry out a nano-scale phase separation at a temperature above the critical temperature. In the invention, temperature responsive polymers run through a cross-linked polymer network to form an interpenetrating network structure thus a molecular-scale uniform distribution is realized. Through a hydrogel system nano-scale phase change produced through a solubility change of temperature responsive polymers, a transition from a transparent appearance to an opaque appearance is realized, wherein the solubility change is produced when temperature changes.

Description

technical field [0001] The invention relates to an intelligent optical composite material, in particular to a temperature-sensitive intelligent glass based on nanoscale phase transition of a hydrogel system. Background technique [0002] Smart material refers to a composite material that imitates a living system, can perceive environmental changes, and can adjust or change the performance parameters of the material itself in time according to the perceived environmental parameters, and make expected changes that can adapt to the changed environment. Combination of materials. Life-like sensation and self-regulation are important features of smart materials. [0003] With the development of the times, the intelligent construction of buildings will become more and more in-depth. The content and meaning of intelligent buildings will continue to expand with the development of science and technology, and their functions will also continue to expand to meet the growing needs of pe...

Claims

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Application Information

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IPC IPC(8): B32B17/10C08J3/075
Inventor 付国东
Owner 青岛至慧新材料科技有限公司
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