Preparation method of poly(N-isopropylacrylamide) (PNIPAm) microgel and vanadium dioxide/silicon dioxide/PNIPAm composite microgel

A technology of microgel and micelles, which is applied in the suspension polymerization preparation of VO2/SiO2/PNIPAm composite microgel, and in the field of suspension polymerization preparation of PNIPAm microgel, which can solve the problem of poor dispersion of hydrogel and phase transition of PNIPAm Slow speed and other problems, to achieve the effect of easy operation, high output and simple production process

Active Publication Date: 2019-02-01
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for creation of small particles called nanoclusters that have good optics properties such as transmitting sunlight or shading colors when exposed to different wavelength ranges like infrared rays. These tiny particles also exhibit great heat transmission due to their large surface area per unit weight compared to other materials commonly found on windows today's marketplace. By adding these nanospheres onto a special type of gel made from certain types of molecules, they could make it look more beautiful than traditional glass panels without losing its effectiveness over time.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding new types of optothrochromatic or pyrosilvanitanoelectric crystal structures suitable for use in electronic devices like smart windows. These nanostructures exhibiting these feature include Vanadia type double metal layers and layered silicate clathrils containing vanadyl sulfate molecules. However, existing methods for coating these materials onto substrates suffer drawbacks including lack of controllability over both phases during manufacturing processes and poor film quality resulting in decreased durability and reduced luminescence efficacy of the final product.

Method used

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  • Preparation method of poly(N-isopropylacrylamide) (PNIPAm) microgel and vanadium dioxide/silicon dioxide/PNIPAm composite microgel
  • Preparation method of poly(N-isopropylacrylamide) (PNIPAm) microgel and vanadium dioxide/silicon dioxide/PNIPAm composite microgel
  • Preparation method of poly(N-isopropylacrylamide) (PNIPAm) microgel and vanadium dioxide/silicon dioxide/PNIPAm composite microgel

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Embodiment 1

[0048] Embodiment 1: a kind of PVP content is the preparation method of the polyisopropylacrylamide (PNIPAm) microgel of 1g / L, comprises following operation:

[0049] Dissolve 0.05g (1g / L) of PVP surfactant with a molecular weight of 58000 in 50ml of aqueous solution, transfer it to a 250ml three-neck flask, and keep it warm at 50°C for 30 minutes. After stable micelles are formed, add 1.25g (2.5wt %) NIPAm monomer and the corresponding ratio of Bis (such as 1wt% of the monomer mass) as a cross-linking agent, after the monomer and cross-linking agent are completely dissolved, the temperature is raised to 60°C, and the initiator KPS (0.01g / ml) is added dropwise PNIPAm microgels were synthesized by suspension polymerization and kept for 12 hours.

Embodiment 2

[0051] A kind of preparation method of the higher polyisopropylacrylamide (PNIPAm) microgel of PVP content, comprises following operation:

[0052] Dissolve 0.1g-0.2g (2-4g / L) (that is, 2g / L, 3g / L, 4g / L respectively) of PVP surfactant with a molecular weight of 58000 into 50ml of aqueous solution and transfer it to a 250ml three-necked bottle. Incubate at 50°C for 30 minutes until stable micelles are formed, add 1.25g (2.5wt%) NIPAm monomer and a corresponding proportion of Bis (such as 1wt% of the monomer mass) under nitrogen protection as a crosslinking agent, and the monomer and crosslink After the reagent was completely dissolved, the temperature was raised to 60° C., and the initiator KPS (0.01 g / ml) was added dropwise for suspension polymerization to synthesize PNIPAm microgels, which were kept for 12 hours.

[0053] Heating the copper jacket using a homemade glass tank and water bath (see Figure 9 , where the glass jacket is used to hold the test sample and can be dir...

Embodiment 3

[0059] Embodiment 3: a kind of PVP content is the VO of 2g / L 2 @SiO 2 The preparation method of / PNIPAm composite material comprises following operation:

[0060] VO 2 @SiO 2 Preparation of powder: 0.05g VO 2 The powder (prepared by the hydrothermal reaction method) is uniformly dispersed in a 20ml glass reagent bottle (10ml ethanol, 20g zirconia balls with a diameter of 0.5mm), and is magnetically stirred at room temperature for about 8-10 hours at a speed of 600- 1000rpm. Then add 100 μl tetraethyl orthosilicate (TEOS) into the system and disperse uniformly for 1 hour. Slowly add 5 mL of ammonia water ethanol solution (ammonia water concentration 10%-20%) dropwise into the original system through a peristaltic syringe pump, react for 8 hours, and stop the reaction after the hydrolysis is completed. The product was washed twice with water and ethanol solution;

[0061] will VO 2 @SiO 2 powder to make VO 2 The content is 80.63mg / L, dispersed in the solution with PVP c...

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Abstract

The invention relates to a preparation method of poly(N-isopropylacrylamide) (PNIPAm) microgel and vanadium dioxide/silicon dioxide/PNIPAm composite microgel. The preparation method of the PNIPAm microgel comprises the following steps: carrying out a micelle forming procedure: concretely dissolving a nonionic surfactant in water at a concentration of 0.5-4 g/L, and carrying out standing for 0.5-6hours at a temperature of 20-80 DEG C to form a solution containing stable micelles; and carrying out a cross-linking and polymerization procedure: concretely dissolving N-isopropylacrylamide monomersand a cross-linking agent in a solution under the protection of an inert atmosphere, controlling the addition amount of the N-isopropylacrylamide monomers to be 2-3 wt% of the mass of the solution, adding an initiator, and keeping the temperature at 20-80 DEG C for 12-20 hours to obtain the PNIPAm microgel. The preparation method is simple in process, and the penetration rate of the obtained PNIPAm microgel is relatively high and can reach 90%.

Description

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Claims

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Application Information

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Owner SHANGHAI UNIV
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