Composite film based on glassy carbon and graphene and preparation method thereof

A composite film, graphene technology, applied in the field of composite materials, can solve the problem of glassy carbon easily broken

Active Publication Date: 2010-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, because glassy carbon is easy to break, the thickness

Method used

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  • Composite film based on glassy carbon and graphene and preparation method thereof
  • Composite film based on glassy carbon and graphene and preparation method thereof
  • Composite film based on glassy carbon and graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the preparation method described in this embodiment comprises the following steps:

[0025] 1, the modified graphene that is the organic solvent dispersibility of 0.5% by weight percentage is in the N of the polyamic acid (PMDA / ODA system) of 10% solid content ultrasonic dispersion, after N-dimethylacetamide solution, in Coating film on the substrate, controlling the thickness to 1000 microns, heating at 60°C for 12 hours, removing the polar solvent, and keeping it in a vacuum oven at 300°C for 1 hour to complete the imidization, thereby forming a polyimide film with a thickness of about 100 microns. Amine precursor films.

[0026] 2. Sandwich the obtained polyimide / graphene composite film between two precisely polished graphite sheets, and under the protection of argon, start from room temperature at a rate of 0.2°C / min to 900°C and keep it warm for 1 hour. Thereby obtaining Sigradur K glassy carbon / graphene composite film. The flexural st...

Embodiment 2

[0028] The steps are as in Example 1, the weight percentage of modified graphene is changed to 50%, and the solid content of polyamic acid is reduced to 5%. The flexural strength of the glassy carbon / graphene composite film obtained at this time was 600 MPa.

Embodiment 3

[0030] The steps are as in Example 1, changing the polyamic acid of the PMDA / ODA system into the polyamic acid of the s-BPDA / ODA system. The flexural strength of the glassy carbon / graphene composite film obtained at this time was 550 MPa.

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Abstract

The invention belongs to the technical field of composite materials and relates to a composite film based on glassy carbon and graphene and a preparation method thereof. A composite film precursor comprises the following components in percentage by mass: 0.1 to 50 percent of graphene sheet and 99.9 to 50 percent of polyimide substrate. The preparation method comprises the following step of: carrying out carbonization on a polyimide precursor film at the temperature of less than 2500 DEG C to obtain the composite film based on the glassy carbon and the graphene. The flexural strength of the prepared composite film can reach more than 600MPa.

Description

technical field [0001] The invention relates to a material in the technical field of composite materials and a preparation method thereof, in particular to a composite film based on glassy carbon and graphene and a preparation method thereof. Background technique [0002] Glassy carbon, as a special carbon material, has the advantages of both carbon and glass material properties. Compared with general carbon or graphite materials, it has many excellent properties: high mechanical strength, glass-like, air-tight, Strong chemical corrosion resistance, long-term resistance to strong acid corrosion, good thermal stability, strong oxidation resistance, not easily oxidized by air below 600 °C, and can withstand high temperatures of 3000 °C in inert gas. During use, carbon-free The powder flakes off, does not produce pollution, is easy to clean, and can conduct electricity and heat. Therefore, glassy carbon is widely used in chemical industry, metallurgy, semiconductor industry an...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 胡南滔魏浩张亚非高润纲王艳艳
Owner SHANGHAI JIAO TONG UNIV
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