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Polymer/graphene aerogel composite foam material and preparation method thereof

A graphene airgel and composite foam technology, applied in the direction of graphene, nano-carbon, etc., can solve problems such as difficult to effectively control graphene graphene network, achieve high mechanical strength, avoid agglomeration, and avoid uneven dispersion Effect

Active Publication Date: 2018-07-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing idea of ​​preparing polymer / graphene composite foam materials, the graphene and polymer matrix are blended and then foamed to form composite foam materials. Due to the formation of cells in the foaming process, graphene The relative position will keep changing, and it is actually difficult to effectively control the position of graphene to form a complete graphene network. Therefore, even if the dispersion of graphene in the blend is improved, it may not guarantee the formation of graphene in the polymer. Highly connected three-dimensional conductive network

Method used

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  • Polymer/graphene aerogel composite foam material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] (1) Preparation of graphite oxide

[0040] Using expandable graphite with a sheet size of about 200 μm as raw material, react at 900°C for 5 minutes to obtain expanded graphite, and prepare graphite oxide by modifying the Hummers method: mix expanded graphite, sodium nitrate, and concentrated sulfuric acid at a ratio of 1g:0.5g:100mL in Stir in an ice bath for 10 minutes, slowly add potassium permanganate according to the ratio of 8g potassium permanganate per 1g of expanded graphite, after adding potassium permanganate, react at 35°C for 2.5h, and then add 8g of potassium permanganate per 1g of expanded graphite The proportion of 200mL water was diluted with deionized water, and 120mL of 5wt% H 2 o 2 The solution terminates the reaction, and then centrifuges after repeated washing with hydrochloric acid and deionized water. When the supernatant obtained by centrifugation is neutral, freeze-dry for 48 hours to obtain graphite oxide. Measure the carbon-oxygen molar rati...

Embodiment 2

[0049] In this implementation, the preparation of thermoplastic polyurethane / graphene airgel composite foam material, the steps are as follows:

[0050] (1) Preparation of graphite oxide

[0051] Using expandable graphite with a sheet size of about 300 μm as raw material, graphite oxide was prepared according to the method in step (1) of Example 1.

[0052] (2) Preparation of graphene airgel

[0053] Disperse graphite oxide in water, and mechanically stir at 200 r / m for 1 h to obtain a 5 mg / mL graphene oxide solution. The sheet size of graphene oxide is 20-30 μm. Add 100mg of ascorbic acid to 10mL, 5mg / mL graphene oxide solution, stir mechanically at a speed of 200r / m for 15min and mix well, and then place it in an oil bath at 90°C under airtight conditions for heating and reduction for 3h to obtain partially reduced oxidized Graphene hydrogel, soak the obtained hydrogel in deionized water for 7 days, replace it with new deionized water every 24 hours, then freeze it at -10°...

Embodiment 3

[0059] In this implementation, the polystyrene / graphene airgel composite foam material is prepared, and the steps are as follows:

[0060] (1) Preparation of graphite oxide

[0061] Graphite oxide was prepared according to the method in Example 1 step (1).

[0062] (2) Preparation of graphene airgel

[0063]Disperse graphite oxide in water, and ultrasonically stir at a speed of 200 r / m for 0.5 h to obtain a 3 mg / mL graphene oxide solution. The sheet size of graphene oxide is 10-25 μm. Add 120mg of ethylenediamine to 10mL, 3mg / mL graphene oxide solution, stir mechanically at a speed of 200r / m for 15min to mix evenly, then place it in an oven under airtight conditions and heat reduction at 80°C for 1h to obtain partially reduced Graphene oxide hydrogel, soaking the obtained hydrogel with ethanol-water solution with ethanol volume percentage of 20% for 2 days, during which a new ethanol water solution was replaced every 12 hours, and then placed under the condition of -20°C for...

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Abstract

The invention provides a polymer / graphene aerogel composite foam material which is prepared from graphene aerogel and a thermoplastic polymer, wherein the graphene aerogel serves as a framework, the thermoplastic polymer is attached to the three-dimensional net structures of the graphene aerogel, and foam holes with closed pore structures are formed in the thermoplastic polymer. The composite foammaterial has mutually communicated three-dimensional net structures, and the content of the graphene aerogel in the composite foam material is 0.5%-10%. The invention also provides a preparation method of the composite foam material. The invention provides a new idea for solving the problem of agglomeration of graphene in polymer matrix materials.

Description

technical field [0001] The invention belongs to the field of polymer composite foam materials, and relates to a polymer / graphene airgel composite foam material and a preparation method thereof. Background technique [0002] Polymer foam has excellent properties such as low density, sound absorption, shock absorption, and heat preservation, and has attracted extensive attention from the scientific and industrial circles. Foaming using supercritical fluid is a newly developed foaming technology. This technology is green and environmentally friendly. Its most important advantage is that it can reduce the weight of foam materials without losing its mechanical properties. In the process of preparing polymer foam materials, adding inorganic nanoparticles as a heterogeneous nucleating agent is an important means to reduce the cell size, increase the cell density and improve the cell structure of the material. [0003] Graphene is one of the ideal fillers for improving polymer foam...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L25/06C08L67/04C08L23/12C08K3/04C08J9/12C01B32/184
CPCC08J9/122C08J2203/06C08J2203/08C08J2205/052C08J2323/12C08J2325/06C08J2367/04C08J2375/08C08K3/04
Inventor 廖霞蒋秋月李浚松李光宪
Owner SICHUAN UNIV
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