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Graphitized film and preparation method and application thereof

A technology of graphitization and graphene, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of easy cracking, large shrinkage, low surface flatness, etc., to improve thermal conductivity, increase the degree of orientation, Avoid the effect of reunion

Inactive Publication Date: 2018-07-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a graphitized film with excellent comprehensive performance and its preparation method in order to overcome the problems of large shrinkage, low surface smoothness and easy cracking in the graphitization process of the prior art.

Method used

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  • Graphitized film and preparation method and application thereof
  • Graphitized film and preparation method and application thereof
  • Graphitized film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0052] Graphite (5g) and KOH (200g) were mixed into a ball mill jar equipped with stainless steel grinding balls, and rotated for 12 hours at a speed of 500rpm and in forward and reverse mode (every 30min interval of 1min and then reversed for 30min). The resulting product was removed with deionized water (100 mL) and centrifuged at 4000 rpm for 20 min to retain the supernatant, then pour the supernatant into a dialysis bag and dialyze in deionized water for 48 h to remove K + . The resulting solution was freeze-dried at -60°C for 60 h, and it was confirmed by characterization that edge hydroxylated graphene was obtained, with a yield of 4.8 g.

preparation example 2

[0054] Graphite (5g) and dry ice (75g) were mixed into a ball mill jar equipped with stainless steel grinding balls, and rotated for 48 hours at a speed of 200rpm in forward and reverse mode (every 30min interval of 1min and then reversed for 30min). The obtained product was directly removed, and then Soxhlet extraction was performed on it with hydrochloric acid solution (1M 100mL) (heating temperature was 100°C, heating time was 2.5h), to make it completely acidified, and finally it was freeze-dried at -120°C for 24h, and the Characterization confirmed that edge carboxylated graphene was obtained with a yield of 4.6 g.

Embodiment 1

[0056] This embodiment is used to illustrate the graphitized film of the present invention and its preparation method and application.

[0057] (1) Ultrasonic dispersion of edge hydroxylated graphene (0.58g) and p-phenylenediamine (PPD, 0.89g) prepared in Preparation Example 1 in N,N'-dimethylacetamide (20mL ), to obtain a uniform and stable dispersion;

[0058] (2) Add biphenyltetracarboxylic dianhydride (BPDA, 2.44g) in step (1), adopt the method for low-temperature in-situ polymerization to react at 0 DEG C for 2h, make graphene / polyamic acid mixed solution, solution solid The content is 15% by weight, the viscosity is 2500cP, and the weight ratio of graphene and polyamic acid is 15:100;

[0059] (3) cast the mixed solution obtained in step (2) into a film after defoaming by standing method to obtain a graphene / polyamic acid composite film, and the content of the organic solvent in this film is 40% by weight;

[0060] (4) Biaxially stretch the film obtained in step (3), w...

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Abstract

The invention relates to the technical field of functional film materials, and in particular relates to a graphitized film and a preparation method and application thereof. The preparation method of the graphitized film comprises: (1) low temperature in-situ polymerization of a diamine monomer and a dianhydride monomer; (2) film casting of an obtained mixed solution; (3) in-sequence drawing treatment and heating imidization of an obtained graphene / polyamic acid composite film; (4) and in-sequence heating carbonization and heating graphitization of an obtained graphene / polyimide composite film.Edge-functionalized graphene is used as a filler, and the graphene / polyamic acid composite film is appropriately drawn to improve the orientation and regularity of the composite film, and so that theobtained graphitized film has high directivity, high conductivity and high thermal conductivity, and is expected to be better applied in microelectronic packaging, electromagnetic shielding, heat dissipating materials, electrode materials and other aspects.

Description

technical field [0001] The invention relates to the technical field of functional thin film materials, in particular to a graphitized film and its preparation method and application. Background technique [0002] Due to its outstanding heat resistance and chemical resistance, high thermal diffusivity and electrical conductivity, and low thermal expansion coefficient and gas permeability, graphitized films are widely used in heat dissipation materials, heat-resistant sealing materials, and electromagnetic shielding materials And various fields such as fuel cells. The current commercialized graphitized film is mainly formed by rolling expanded graphite or high-temperature pyrolysis of polymer film. Compared with the graphitized film formed by rolling expanded graphite, the graphitized film produced by high temperature pyrolysis of polymer film has higher thermal diffusivity, mechanical strength and flexibility. [0003] The current polymer graphitized film mainly uses epoxy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205
CPCC01P2002/82C01P2002/85
Inventor 武德珍杨丹田国峰齐胜利闫晓娜张梦颖
Owner BEIJING UNIV OF CHEM TECH
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