Preparation method for CQDs@PVP/PVDF composite dielectric film

A composite dielectric film and composite film technology, which is applied in the field of composite film materials, can solve the problems of unsolved carbon quantum dot dispersion problems, composite material dielectric properties, carbon quantum dots are easy to agglomerate, and increase the breakdown field strength. Achieve the effect of strong repeatability, low cost and good flexibility

Active Publication Date: 2018-12-25
WUHAN UNIV OF TECH
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Problems solved by technology

However, carbon quantum dots are easy to agglomerate, and it is difficult to disperse uniformly in the polymer matrix. Therefore, it is necessary to coat the surface with a layer of organic matter, which not only reduces the dielectric loss but also increases the breakdown field strength.
Chinese patent CN107815305A discloses a CDs / PVDF composite film and its preparation method. This method only adds carbon quantum dots as fillers to PVDF to explore the problem of fluorescence quenching, but does not solve the problem of dispersion of carbon quantum dots and the mediation of composite materials. electrical performance problem

Method used

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  • Preparation method for CQDs@PVP/PVDF composite dielectric film
  • Preparation method for CQDs@PVP/PVDF composite dielectric film
  • Preparation method for CQDs@PVP/PVDF composite dielectric film

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Embodiment 1

[0026] 1) Use a graphite rod as an electrode, insert it into a beaker filled with 700mL of ultrapure water, immerse the graphite rod by 4 cm in the liquid surface, and keep the distance between the two graphite rods by 10 cm, then pass through 60V DC for electrolysis, and electrolyze the electrolyte solution after 7 days Perform high-speed centrifugation at a speed of 10,000 r / min, take the upper layer of light yellow clear liquid, and place it in an electric blast drying oven at 60°C for 8 hours to obtain carbon quantum dot nanoparticles.

[0027] 2) Weigh 1 g of carbon quantum dots, disperse them in deionized water, stir them magnetically for 2 hours, and then ultrasonically disperse them evenly for 1 hour. Weigh 5g of PVP powder, add it into the carbon quantum dot aqueous solution, and stir magnetically at room temperature for 24 hours. After fully reacting, the solution was centrifuged at 10,000 rpm, and the solid product was washed three times with absolute ethanol, and t...

Embodiment 2

[0034] 1) Use a graphite rod as an electrode, insert it into a beaker filled with 700mL of ultrapure water, immerse the graphite rod by 4 cm in the liquid surface, and keep the distance between the two graphite rods by 10 cm. After 7 days of electrolysis, the electrolyte solution was centrifuged at a speed of 10000r / min at a high speed, and the upper layer of light yellow clear liquid was taken, and it was placed in an electric blast drying oven at 60°C for 12 hours to obtain Carbon quantum dot solid nanoparticles.

[0035] 2) Weigh 1 g of carbon quantum dots, dissolve them in deionized water, stir them magnetically for 2 hours, and then disperse them ultrasonically for 1 hour. Weigh 5g of PVP powder, add it into the carbon quantum dot solution, and stir magnetically at room temperature for 24 hours. After fully reacting, the solution was centrifuged at 10,000 rpm, and the solid product was washed three times with absolute ethanol, and then dried in a constant temperature dry...

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Abstract

The invention relates to a preparation method for a CQDs@PVP/PVDF composite dielectric film. The method comprises the following steps: firstly electrolyzing to obtain carbon quantum dots through a graphite rod electrode, secondly coating the carbon quantum dots in solution by using PVP so as to improve dispersity and interfacial compatibility of the carbon quantum dots, thirdly mixing the carbon quantum dots and the PVDF solution and performing film casting and hot-press shaping, and finally preparing the composite film which is good in toughness and excellent in dielectric property. The method is simple and easy to control, low in cost, and strong in repeatability. In addition, the prepared film is higher in purity, wide in application, and has better application prospect in the technicalfields of a non-volatile storage, an optical storage, a piezoelectric and photoelectric device and the like.

Description

technical field [0001] The invention relates to the technical field of composite film materials, in particular to a preparation method of a CQDs@PVP / PVDF composite dielectric film. Background technique [0002] Polyvinylidene fluoride (PVDF) has good physical and chemical stability. Compared with most other polymer materials, PVDF materials have relatively high dielectric constant and extremely low dielectric loss, so they are widely used in the research and development of flexible dielectric materials. However, the dielectric constant of a single PVDF is still low, which cannot meet people's requirements for high dielectric performance materials, so researchers use various methods to add one or more conductive materials (such as copper, aluminum, graphene) as fillers. into the PVDF polymer matrix to prepare composite materials with special properties. For related documents, please refer to Chinese patents CN102632675B, CN101423645A, CN102558718A, CN108264710A and CN1067512...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/10C08K3/04C08J5/18
CPCC08J5/18C08J2327/16C08K3/04C08K9/10C08K2201/011
Inventor 刘晓芳李念刘文轩
Owner WUHAN UNIV OF TECH
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