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Highly conductive polymer-carbon-based composite airgel and its preparation method

A composite airgel, high conductivity technology, applied in the field of nanometer and material chemistry, can solve the problems of production cost and commercial application, and achieve the effect of good structural integrity, high surface area-volume ratio, and enhanced conductivity

Active Publication Date: 2021-01-15
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high production costs associated with making silica aerogels have limited broad commercial applications, which are currently limited to high-value military and aerospace projects

Method used

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  • Highly conductive polymer-carbon-based composite airgel and its preparation method
  • Highly conductive polymer-carbon-based composite airgel and its preparation method
  • Highly conductive polymer-carbon-based composite airgel and its preparation method

Examples

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preparation example Construction

[0034]The preparation of the polymer precursor adopts a compound with at least one carboxyl functional group and a polymer with at least one alcohol group, and the ratio of water and ethanol (or other organic solvents) is 0:1~99.9:1v / v (volume ratio) , In a solution with a temperature range of 40°C to 95°C, it is formed under stirring with hydroiodic acid as a catalyst. The former uses, for example (but not limited to), 4-carboxybenzaldehyde (CAS: 619-66-9), and the latter uses, for example (but not limited to), polyvinyl alcohol (CAS: 9002-89-5). Firstly, 4-carboxybenzaldehyde (selected according to the ratio) was dissolved in ethanol and vigorously stirred at 55°C for at least 30 minutes. When completely dissolved, the corresponding polyvinyl alcohol was added to the solution and stirred at 80 °C for at least 4 hours. The use of hydriodic acid dehydrogenates two precursor polymer molecules while forming a conjugated bond in the main polymer chain. In the examples presented...

Embodiment 1

[0038] Obtain dry graphite oxide through graphite oxide flakes by Hummers method, then add dry graphite oxide into 99.9% ethanol solution, and mildly sonicate to form a 7.5 mg / mL dispersion. The dispersion was poured into a 100 mL beaker, and combined with the prepared polymer precursor at a mass ratio of 10:1. In this step, it is very important to maintain relatively high concentrations of the two solutions in order to allow easier aggregation of graphene oxide sheets with the polymer and to avoid monolithic dispersion in the dispersion medium. Then react the obtained solution in a water bath not higher than 85° C. for about 60 minutes to obtain tough graphene oxide wet gel. The wet gel has formed a network structure inside, but all the pores are filled by the dispersion medium. Then with supercritical CO 2 Dry the wet gel to extract the dispersion medium. Put the wet gel into the extraction chamber, under the pressure of 7.5MPa and the temperature of 50℃, with liquid CO ...

Embodiment 2

[0041] Another graphene oxide airgel was prepared in the same manner as in Example 1, except that the polymer solution was added to the dispersion at a ratio of 2.5:1. The resulting polymer-graphene oxide composite airgel is as figure 1 (middle), it has a more compact and less brittle structure than other aerogels.

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Abstract

The invention relates to high-conductivity polymer-carbon-based composite aerogel and a production method thereof. The high-conductivity polymer-carbon-based composite aerogel comprises carbon atoms distributed in a flake nano-structure mode and a polymer which is connected with the carbon atoms through covalent bonds; and the polymer comprises a polymer containing at least one carboxyl group anda polymer containing at least one alcoholic group. The polymer-carbon-based composite aerogel is polymer-graphene oxide composite aerogel or polymer-graphene composite aerogel; and the polymer which has at least one carboxyl group is 4-carboxybenzaldehyde and the like, and the polymer which has at least one alcoholic group is polyvinyl alcohol, a polymer which is obtained by conducting hydroxyl modification on poly-p-phenylene, a polymer which is obtained by conducting hydroxyl modification on poly-p-xylylene, or the like. According to the aerogel, pure graphene oxide or graphene is used, by combining the pure graphene oxide or graphene and an intrinsically conductive polymer through the covalent bonds, the conductivity performance is greatly improved, and large-scale industrial productionis benefited.

Description

technical field [0001] The invention belongs to the fields of material chemistry and nanotechnology, and in particular relates to a preparation method of a high-conductivity polymer-carbon-based composite airgel. Background technique [0002] Aerogels are three-dimensional materials with open-cell foam structures with high relative surface area and nanopore size. The most common type of aerogel is silica aerogel, which consists of bonded silicon and oxygen atoms bound together in long chains, which then form beads that link together randomly, with air pockets between them. [0003] Silica aerogels are among the lowest-density solids known and possess many potentially useful properties. However, the high production costs associated with making silica aerogels have limited broad commercial applications, which are currently limited to high-value military and aerospace projects. Another type of aerogel is carbon-based aerogel, which consists of a network of aggregated carbon n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/00C08K3/04C08J9/28B01J13/00
CPCB01J13/0091C08J9/28C08J2300/00C08K3/042Y02P20/54
Inventor 尚静亨利·格莱客朱彤
Owner PEKING UNIV
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