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Modified polyvinylalcohol graphene, preparation method and application thereof

A polyvinyl alcohol and graphene technology, applied in the field of materials, can solve the problems of graphene output and overall quality limitations, and achieve the effects of wide application and promotion, easy process and simple preparation method

Active Publication Date: 2018-02-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are limitations in the yield and overall quality of the produced graphene

Method used

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  • Modified polyvinylalcohol graphene, preparation method and application thereof
  • Modified polyvinylalcohol graphene, preparation method and application thereof
  • Modified polyvinylalcohol graphene, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: mPVOH stripping graphene and stripping effect 1

[0037] Graphene was prepared by dispersing 25 g of natural graphite and 8 g of Kuraray LPTC161 in 1 L of deionized water, using a high speed steel mixer (24.000 rpm) with 28 mm diameter blades to generate the shear force and hydrodynamics required to exfoliate the graphite into graphene pressure. After a mixing time of 100 min, the dispersion was centrifuged at 4000 rpm for 60 min to remove large particles and unexfoliated material, and the supernatant was collected and analyzed to evaluate the quality and size of the obtained graphene particles. Finally, the resulting supernatant was lyophilized overnight to remove water. The resulting material is foamy mPVOH-rich graphene, which is finally washed repeatedly to remove mPVOH and stored at room temperature.

[0038] The prepared multilayer graphene dispersion was dispersed in deionized water at a ratio of 1:100, and added to a transmission electron microscope...

Embodiment 2

[0039] Example 2: mPVOH stripping graphene and stripping effect 2

[0040] Graphene was prepared by dispersing 25 g of natural graphite and 8 g of Nippon Goeshei OKS 6026 in 1 L of deionized water. A rotor-stator high shear mixer (at 12000 rpm) was used to generate the shear required to exfoliate the graphite into graphene. After a mixing time of 100 minutes, the dispersion was centrifuged at 4000 rpm for 60 minutes to remove large particles and unexfoliated material. The supernatant was collected and analyzed to evaluate the quality and size of the obtained graphene particles. Finally, the resulting supernatant was lyophilized overnight to remove water. The resulting material was foamy mPVOH-rich graphene, which was stored at room temperature after repeated washing to remove the polyvinyl alcohol.

[0041] figure 2 showed TEM images of several-layer graphene particles consisting of 5–10 layers reaching a length of 4.9 μm. A carbon mesh can also be seen below, indicating...

Embodiment 3

[0042] Example 3: mPVOH exfoliated graphene effect 3

[0043] Dissolve 20 grams of Synthomer Alcotex 552P in 100 milliliters of methanol, add 1.4 grams of modifier VEC, add initiator BPO 0.2 and stir at 90 degrees for 6 hours, then add methanol to purify and distill to obtain the synthesized mPVOH, which has higher crystallinity Spend. Dissolve 10 grams of expanded graphite and 1.5 grams of mPVOH in 500 milliliters of distilled water, use a high-speed stirrer to stir at 10,000 rpm for 90 minutes, then centrifuge the liquid at 4,000 rpm to obtain the supernatant and centrifuge several times, then The samples were washed repeatedly to obtain exfoliated graphene.

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PUM

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Abstract

The invention relates to the technical fields of methods and materials, and specifically relates to modified polyvinylalcohol graphene, a preparation method and application thereof. The modified polyvinylalcohol graphene is prepared and obtained through the method comprising the following steps: forming thinner graphene particles through the stripping of external actions in a solvent containing modified polyvinylalcohol from graphene, wherein the graphene particles comprise single-layer graphene, multi-layer graphene and nanometer flake graphite; and then separating the stripped graphene particles to obtain modified polyvinylalcohol graphene; wherein the external actions comprise shearing force, centrifugal force, rotating force and fluid force. The graphene obtained through the method hasthe advantages of high purity, good quality and low graphene number of layers, and is used for thin film or fiber processing or improving the modification of high polymer materials.

Description

technical field [0001] The method of the invention relates to the technical field of materials, specifically modified polyvinyl alcohol graphene and its preparation method and application. Background technique [0002] Graphene is a two-dimensional material with a thickness of only one atom. Its outstanding properties (especially mechanical and electrical properties, as well as optical properties) make it a potential material for next-generation electronic components, and it is also suitable as a filler for Various industries. [0003] Graphene can be prepared by different methods, the most common ones are: liquid phase exfoliation method, vapor phase deposition method, redox method, micromechanical exfoliation method, epitaxial growth method, etc. Graphene prepared by each different method has different uses according to the application goals. For polymer composites, graphene is in high demand and can be of moderate quality. But some applications must require high-qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C08K3/04C08L29/04
CPCC01B2204/04C01B2204/22C01B2204/30C01P2002/01C08K3/04C08L29/04
Inventor 夏和生拉瓦叶纳·马里罗道格拉斯·亚历山大·赛蒙亨利·斯蒂芬·史雷克尔路易·安部拉索王健伊芙琳·比绍夫拉奎尔·圣托斯·穆勒尔
Owner SICHUAN UNIV
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