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Preparation method for polyvinylidene fluoride/poly-dopamine-coated graphene nanocomposite

A technology of nano-composite materials and polyvinylidene fluoride, which is applied in the field of dielectric materials and nano-composite materials, can solve the problems of increasing dielectric loss, sharp increase in leakage loss, etc. effect used

Active Publication Date: 2014-10-15
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such composites show a significant increase in dielectric constant near the threshold, the overall dielectric loss is also significantly increased due to the sharp increase in leakage loss due to the formation of a conductive network.
Therefore, suppressing the dielectric loss of polyvinylidene fluoride / conductive filler dielectric composites remains a great challenge

Method used

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  • Preparation method for polyvinylidene fluoride/poly-dopamine-coated graphene nanocomposite
  • Preparation method for polyvinylidene fluoride/poly-dopamine-coated graphene nanocomposite
  • Preparation method for polyvinylidene fluoride/poly-dopamine-coated graphene nanocomposite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: At 0°C, add 6g of graphite, 3g of sodium nitrate and 180mL of concentrated sulfuric acid into a three-neck flask, mix well, then add 18g of potassium permanganate, react for 2h, react at 35°C for 35 minutes, add 300mL of water at 98°C Stir and react for 3 hours, after cooling to room temperature, add 2 kg of water and 50 mL of 30% hydrogen peroxide, stir for 2 hours, repeatedly centrifuge and wash with deionized water until neutral, and disperse in water by ultrasonication for 30 minutes.

[0037] Step 2: Take 1 part by weight of graphene oxide obtained in step (1), and prepare its concentration to 2 mg / mL.

[0038]Step 3: Add dopamine hydrochloride to the 200 mL dispersion obtained in step (2), and prepare the concentration to 1.25 mg / mL.

[0039] Step 4: Add 6 mL of ammonia water dropwise to the mixed system obtained in step (3), adjust the pH value to be alkaline, keep the temperature of the water bath at 60°C, and stir for 12 hours to polymerize dopamine.

...

Embodiment 2

[0046] Step 1: At 0°C, add 6g of graphite, 3g of sodium nitrate and 180mL of concentrated sulfuric acid into a three-neck flask, mix well, then add 18g of potassium permanganate, react for 2h, react at 35°C for 35 minutes, add 300mL of water at 98°C Stir and react for 3 hours, after cooling to room temperature, add 2 kg of water and 50 mL of 30% hydrogen peroxide, stir for 2 hours, repeatedly centrifuge and wash with deionized water until neutral, and disperse in water by ultrasonication for 30 minutes.

[0047] Step 2: Take 1 part by weight of graphene oxide obtained in step (1), and prepare its concentration to 1 mg / mL.

[0048] Step 3: Add dopamine hydrochloride to the 400 mL dispersion obtained in step (2), and prepare the concentration to 0.8 mg / mL.

[0049] Step 4: Add 100 mL of 50mM Tris buffer (pH=8.5) to the mixed system obtained in step (3), keep the temperature of the water bath at 60°C, and stir for 24 hours to polymerize dopamine.

[0050] Step 5: The mixed syste...

Embodiment 3

[0056] Step 1: At 0°C, add 6g of graphite, 3g of sodium nitrate and 180mL of concentrated sulfuric acid into a three-neck flask, mix well, then add 18g of potassium permanganate, react for 2h, react at 35°C for 35 minutes, add 300mL of water at 98°C Stir and react for 3 hours, after cooling to room temperature, add 2 kg of water and 50 mL of 30% hydrogen peroxide, stir for 2 hours, repeatedly centrifuge and wash with deionized water until neutral, and disperse in water by ultrasonication for 30 minutes.

[0057] Step 2: Take 1 part by weight of graphene oxide obtained in step (1), and prepare its concentration to 2 mg / mL.

[0058] Step 3: Add dopamine hydrochloride to the 200 mL dispersion obtained in step (2), and prepare the concentration to 1.25 mg / mL.

[0059] Step 4: Add 6 mL of ammonia water dropwise to the mixed system obtained in step (3), adjust the pH value to be alkaline, keep the temperature of the water bath at 60°C, and stir for 12 hours to polymerize dopamine. ...

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Abstract

The invention discloses a preparation method for a high-dielectricity polyvinylidene fluoride / poly-dopamine-coated graphene nanocomposite. The method comprises the following steps: graphene oxide is prepared through a Hummers oxidation method, dopamine is automatically polymerized under the alkaline condition to coat the surface of the graphene oxide, reduction is performed on the poly-dopamine graphene oxide through hydrazine hydrate, centrifugal washing is performed repeatedly for removing impurities, the obtained poly-dopamine-coated grapheme can disperse in N, N-dimethylformamide well after being subjected to ultrasonic treatment, the polyvinylidene difluoride and the poly-dopamine-coated graphene are mixed through a solution method, and hot press molding is performed on the mixture, so that the nanocomposite is obtained. The preparation process is simple and easy to operate, the repeatability is good, the composite is good in flexibility and machinability, and has high potential for being applied to dielectric materials of energy storage parts such as capacitors.

Description

technical field [0001] The invention belongs to the field of dielectric materials and nano-composite materials, and in particular relates to a preparation method of high-dielectric polyvinylidene fluoride / polydopamine-coated graphene nano-composite materials. Background technique [0002] Polyvinylidene fluoride has excellent piezoelectricity, electrical properties, thermal stability and corrosion resistance. At the same time, its flexibility and easy processing characteristics make it the preferred material for dielectric materials. The development trend of miniaturization of electronic industry products requires dielectric materials to have Higher dielectric constant and low loss, so the development of polyvinylidene fluoride composite materials with high dielectric constant and low loss has potential industrial application value. [0003] Currently, conventional methods for preparing polymer-based dielectric composites fall into two categories. Adding intrinsic high diel...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/10C08K3/04C08G73/02
Inventor 傅强李禹函苏晓声陈枫杨中强柴颂刚
Owner SICHUAN UNIV
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