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Polyvinylidene fluoride/graphene composite and preparation method thereof

A technology of polyvinylidene fluoride and composite materials, applied in electrical components, capacitors, circuits, etc., can solve problems such as poor dispersion, uneven dispersion, and affecting the performance of composite materials, and achieve simple preparation process, broad application prospects, mechanical good performance

Active Publication Date: 2012-07-25
嘉善县国创新能源研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene surface is composed of countless aromatic rings, which is inert and easy to agglomerate.
The dispersibility of pure graphene in the solvent is poor, and it is easy to agglomerate in the polymer matrix to form an uneven dispersion, which seriously affects the performance of the composite material.

Method used

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  • Polyvinylidene fluoride/graphene composite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Disperse 1 g of graphene oxide in 1000 g of deionized water, ultrasonically disperse for 2 h, add 0.5 g of hydroquinone, and react at a temperature of 10 ° C for 48 h. After the reactant is filtered, the filter cake is washed with water for 3 times, Wash with ethanol 3 times to remove excess unreacted hydroquinone, and then vacuum dry to constant weight to obtain graphene.

[0036] (2) Add 0.0005 g of graphene prepared in the first step into 20 mL of DMAc, and ultrasonically disperse for 2 h to obtain a uniform graphene suspension. At the same time, 1 g of PVDF was added to 40 mL of DMAc to prepare a PVDF solution. Then blend the graphene suspension with the PVDF solution, ultrasonically disperse the mixed solution for 2h, then pour the solution into a beaker and place it at 40°C for 36h to allow the DMAc to partially evaporate and thicken, and then dry it in a vacuum oven at 80°C until constant.

[0037] (3) The above-prepared blend was cut into thin slices, and ...

Embodiment 2

[0039] (1) Disperse 3g of graphene oxide in 1000g of deionized water, ultrasonically disperse for 4h, add 5ml of phenylhydrazine, and react at a temperature of 30°C for 24h. After the reactant is filtered, the filter cake is washed with ethanol three times in turn, and washed with DMAc 3 times to remove excess unreacted phenylhydrazine, and then vacuum-dried to constant weight to obtain graphene reduced by phenylhydrazine.

[0040] (2) Add 0.002 g of graphene prepared in the first step into 20 mL of DMAc, and ultrasonically disperse for 3 h to obtain a uniform graphene suspension. At the same time, 1 g of PVDF was added to 40 mL of DMAc to prepare a PVDF solution. Then blend the graphene suspension with the PVDF solution, ultrasonically disperse the mixed solution for 3 h, then pour the solution into a beaker and place it at 50 ° C for 24 h to allow the DMAc to partially evaporate and thicken, and then dry it in a vacuum oven at 80 ° C to constant.

[0041] (3) The above-men...

Embodiment 3

[0043] (1) Disperse 5g of graphene oxide in 1000g of deionized water, ultrasonically disperse for 6h, add 10ml of hydrazine hydrate, and react at a temperature of 60°C for 12h. After the reactant is filtered, the filter cake is washed with water for 3 times and ethanol for 3 times to remove excess unreacted hydrazine hydrate, and then vacuum-dried to constant weight to obtain graphene.

[0044] (2) 0.03 g of graphene prepared in the first step was added to 20 mL of DMAc, and ultrasonically dispersed for 4 hours to obtain a uniform graphene suspension. At the same time, 1 g of PVDF was added to 40 mL of DMAc to prepare a PVDF solution. Then blend the graphene suspension with the PVDF solution, ultrasonically disperse the mixed solution for 4 hours, then pour the solution into a beaker and place it at 70°C for 12 hours to allow the DMAc to partially evaporate and thicken, and then dry it in a vacuum oven at 80°C until constant.

[0045] (3) The blend prepared above was cut int...

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Abstract

The invention discloses polyvinylidene fluoride / graphene composite and a preparation method thereof. The preparation method includes: reducing oxidation graphene by reductant, mixing the reduced graphene and polyvinylidene fluoride with N, N-dimethylacetamide solvent to be solution, drying and hot-pressing the solution to obtain the polyvinylidene fluoride / graphene composite. The prepared polyvinylidene fluoride / graphene composite has the following advantages that 1) dielectric constant of the polyvinylidene fluoride / graphene composite is high and can reach 7940 on the condition of 100Hz frequency and the weight percentage of the graphene is 0.02; and 2) flexibility is fine. Meanwhile, the preparation method has the advantages of simple operation and high stripping and dispersing degree of graphene and the like.

Description

1. Technical field [0001] The invention belongs to the technical field of high dielectric materials, and in particular relates to a polyvinylidene fluoride / graphene high dielectric constant composite material and a preparation method thereof. 2. Background technology [0002] New dielectric materials with high dielectric constant have important application prospects in the fields of modern high technology, military reconnaissance and detection, and space technology. But so far, no one-component material has been found that has a sufficiently high dielectric constant and also has good mechanical properties and processability. Although traditional polymer materials have excellent mechanical properties and processing properties, their dielectric constants are too small (≤10). Materials with high dielectric constants, such as ferroelectric ceramics and certain semiconductive organic solids, are very brittle and difficult to process despite their high dielectric constants. Ther...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K3/04C01B31/04
CPCH01G4/206
Inventor 范萍钟明强杨晋涛陈枫费正东王磊
Owner 嘉善县国创新能源研究院
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