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PNIPAm/PPy composite hydrogel as well as preparation method and application thereof

A composite hydrogel and hydrogel technology, applied in chemical instruments and methods, color-changing fluorescent materials, etc., can solve the problems of affecting application, slow response speed, etc., and achieve the effect of low cost, good stability, and excellent light amplification

Pending Publication Date: 2021-08-13
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the disadvantage of slow response speed, which seriously affects its application in smart windows.

Method used

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  • PNIPAm/PPy composite hydrogel as well as preparation method and application thereof
  • PNIPAm/PPy composite hydrogel as well as preparation method and application thereof
  • PNIPAm/PPy composite hydrogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of PNIPAm hydrogel:

[0030] Dissolve 0.02 g of polyvinylpyrrolidone (PVP) with a molecular weight of 58000 in 50 mL of pure water, transfer to a 250 mL three-neck flask, stir at 35 °C for 60 min to form stable micelles, and stir at 60 °C under an inert atmosphere Add 1g of PNIPAm and 0.01g of cross-linking agent N, N'-methylenebis(acrylamide) (BIS), stir evenly, raise the temperature to 60°C, and add 0.02g of initiator potassium persulfate (KPS) after the temperature stabilizes, After stirring at 60°C for 4 h, the PNIPAm hydrogel was obtained by natural cooling to room temperature, and the solid PNIPAm hydrogel was obtained by vacuum freeze-drying.

[0031] (2) Preparation of soluble PPy solution:

[0032] Dissolve 0.2 g of PVP with a molecular weight of 58,000 into 50 mL of pure water, stir evenly to form micelles, transfer to a 250 mL single-necked flask, add 0.69 mL of pyrrole and 2.7 g of KPS to the PVP solution, and place in an ice-water bath (<5 ...

Embodiment 2

[0039] (1) Dissolve 0.05 g of PVP with a molecular weight of 58,000 into 50 mL of pure water, stir at 40°C for 30 min to form stable micelles, and stir at 65°C under N 2 Add 0.8 g of PNIPAm and 0.016 g of cross-linking agent BIS under the atmosphere, stir evenly, heat up to 60°C, add 0.032 g of initiator KPS after the temperature is stable, heat and stir at 60°C for 6 h, stop the reaction, and cool naturally To room temperature to obtain PNIPAm hydrogel, vacuum freeze-drying to obtain solid PNIPAm;

[0040] (2) Dissolve 0.5 g of PVP with a molecular weight of 58,000 into 50 mL of pure water, stir evenly to form micelles, add 0.69 mL of pyrrole and 2.25 g of KPS to the mixed solution, and react in an ice-water bath (<5°C) for 3 After h, the soluble PPy solution was obtained, and the PPy powder was obtained by vacuum freeze-drying.

[0041] (3) Add 10 mL of the PPy solution prepared in step (2) to 50 mL of the PNIPAm hydrogel obtained in step (1), stir ultrasonically for 0.5 h ...

Embodiment 3

[0044] (1) Dissolve 0.1 g of PVP with a molecular weight of 58,000 into 50 mL of pure water, stir at 50°C for 30 min to form stable micelles, and stir at 70°C under N 2 Add 0.5 g NIPAm and 0.005 g cross-linking agent BIS under the atmosphere, stir evenly, raise the temperature to 70°C, add 0.02g initiator KPS after the temperature stabilizes, heat and stir at 70°C for 5 hours, stop the reaction, and cool naturally The PNIPAm hydrogel was obtained at room temperature, and the solid PNIPAm was obtained by vacuum freeze-drying. ;

[0045] (2) Dissolve 0.8 g of PVP with a molecular weight of 58,000 into 50 mL of pure water, stir evenly to form micelles, add 0.35 mL of pyrrole and 1.85 g of KPS, and react in an ice-water bath (<5°C) for 1 h to obtain a soluble PPy solution , vacuum freeze-drying to obtain PPy powder;

[0046] (3) Add 10 mL of the PPy solution prepared in step (2) to 100 mL of the PNIPAm hydrogel obtained in step (1), stir ultrasonically for 1 h at low temperature...

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Abstract

The invention belongs to the field of high polymer materials, and particularly relates to PNIPAm / PPy composite hydrogel as well as a preparation method and application thereof. According to the invention, PNIPAm hydrogel is used as a matrix, and phase transition is rapidly generated through heat absorption of PPy, so the PNIPAm / PPy composite hydrogel is prepared. Polypyrrole has a large p-pi conjugated skeleton and a high electron delocalization structure, shows excellent light amplification and light capture characteristics in a near-infrared light region, has good stability and high photo-thermal conversion efficiency, and is used for adapting to climate changes and adjusting the transmittance of sunlight. The energy-saving effect of the PNIPAm / PPy composite hydrogel is remarkable, and PNIPAm undergoes rapid phase change in summer, so near-infrared light transmission is reduced, and cooling effect is achieved; and in winter, near-infrared light is absorbed by PNIPAm to radiate heat indoors, so indoor heating effect is achieved. Meanwhile, after phase change, the visible light transmittance of the PNIPAm / PPy composite hydrogel is approximately zero, and the function of an intelligent curtain can be achieved. The preparation method for the PNIPAm / PPy composite hydrogel provided by the invention is simple in process, low in cost and beneficial to industrial production and application.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a PNIPAm / PPy composite hydrogel and its preparation method and application. Background technique [0002] At present, building energy consumption accounts for about 40% of the total energy consumption of the national economy. The poor thermal insulation performance of windows is the most serious energy loss part of building components, and the energy loss caused by them exceeds 50% of building energy consumption. Therefore, reasonable control of the heat exchange between the window and the outside world is very important for building energy saving. Solar radiation energy is mainly concentrated in the wavelength range of 0.25-2.5 μm, including ultraviolet light (UV), visible light (Vis) and near-infrared light (NIR), of which NIR radiation energy exceeds 50% of the total solar radiation energy, so Reducing near-NIR transmission in summer and increasing NIR transmissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L33/24C08L39/06C08L79/04C09K9/02
CPCC08J3/075C09K9/02C08J2333/24C08J2439/06C08J2479/04C08J2339/06C08J2433/24C09K2211/14
Inventor 刘燕杨荣光沈明健苏亚张姣姣
Owner JIANGSU UNIV
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