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Preparation method of N-substituted carboxylic acid polyaniline covalently grafted graphene composite material

A technology of covalent grafting and composite materials is applied in the field of preparation of N-substituted carboxylic acid polyaniline covalently grafted graphene composite materials, and can solve the problems of poor compatibility of composite materials, low product purity, and difficulty in popularization and use. , to achieve the effect of inhibiting agglomeration, universal applicability, and improving solubility

Inactive Publication Date: 2016-01-20
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the composite materials prepared by these methods, the interface between graphene and polyaniline composite materials is bonded together through π-π non-covalent bonds, and the purity of the product is not high, and the controllability is not high, which is affected by the interface effect. Although the electrochemical method can strengthen the interfacial interaction, it is difficult to be widely used due to the limitation of equipment
In order to promote the rapid transfer of electrons between the two components, a common improvement method is to introduce functional groups to act as electronic bridges. Although the use of chemical methods to introduce functional groups with strong conductivity on graphene can improve the transfer of electrons to a certain extent, but Still limited, and composites made of graphene and polyaniline are less compatible

Method used

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  • Preparation method of N-substituted carboxylic acid polyaniline covalently grafted graphene composite material
  • Preparation method of N-substituted carboxylic acid polyaniline covalently grafted graphene composite material
  • Preparation method of N-substituted carboxylic acid polyaniline covalently grafted graphene composite material

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Embodiment 1

[0038] This example will illustrate that the method of the present invention uses graphene oxide and p-aminodiphenylamine at a mass ratio of 1:5 to functionalize and partially reduce GO, and then use ammonium persulfate as an oxidizing agent, and the ratio of RGO and N-phenylglycine The mass ratio is 1:2, which is realized according to the chemical oxidation polymerization reaction path.

[0039] GO (100 mg) prepared by the Hummer method was dispersed in 100 ml of DI and sonicated for 30 min to present a uniform dispersion. In a 50ml beaker, dissolve 0.5g of p-aminodiphenylamine (ADPA) in a mixture of 20ml of concentrated hydrochloric acid and 20ml of absolute ethanol (about 6M HCl), and sonicate until dissolved (about 15min). Under ice-water bath, 0.228g of NaNO2 was dissolved in 75ml of ice DI to form a solution. Slowly drop into the above mixture, and continue to stir at this temperature for half an hour after the drop; then slowly drop the above GO dispersion into the ice...

Embodiment 2

[0043] This example will illustrate that the method of the present invention uses graphene oxide and p-aminodiphenylamine at a mass ratio of 1:5 to functionalize and partially reduce GO, and then use ammonium persulfate as an oxidizing agent, and the ratio of RGO and N-phenylglycine The mass ratio is 1:1, which is realized according to the chemical oxidation polymerization reaction path.

[0044] GO (100 mg) prepared by the Hummer method was dispersed in 100 ml of DI and sonicated for 30 min to present a uniform dispersion. In a 50ml beaker, dissolve 0.5g of p-aminodiphenylamine (ADPA) in a mixture of 20ml of concentrated hydrochloric acid and 20ml of absolute ethanol (about 6M HCl), and sonicate until dissolved (about 15min). Under ice-water bath, 0.228g of NaNO2 was dissolved in 75ml of ice DI to form a solution. Slowly drop into the above mixture, and continue to stir at this temperature for half an hour after the drop; then slowly drop the above GO dispersion into the ice...

Embodiment 3

[0048] Repeat Example 1, but change the mass ratio of graphene oxide and p-aminodiphenylamine to 1:2 to obtain a composite material conductivity of 1.3×10 -1 S / cm.

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Abstract

The invention relates to a preparation method of N-substituted carboxylic acid polyaniline covalently grafted graphene composite material. The preparation method of the N-substituted carboxylic acid polyaniline covalently grafted graphene composite material comprises the following steps: taking graphite powder, preparing graphene oxide (GO), and carrying out ultrasonic dispersion to form a uniform solution; then dissolving a certain amount of p-aminodiphenyl amine in a certain volume of mixed solution of concentrated hydrochloric acid and absolute ethyl alcohol, and carrying out ultrasonic dispersion; in ice-water bath, slowly dropwise adding a quantitative NaNO2 solution into the mixed solution, slowly dropwise adding the GO solution after the NaNO2 solution is dropwise added, reacting for a certain period of time, then treating the obtained functional GO, and then reducing by virtue of hydrazine hydrate and ammonia water; and finally dissolving a certain amount RGO and quantitative N-phenylglycin into an HCl solution with constant concentration, carrying out ultrasonic dispersion, adding a certain amount of initiator ammonium persulphate, and reacting for a certain period of time, so that an NPAN covalently grafted RGO composite material is obtained. Electrical conductivity of the prepared composite material can reach 5.0*10<-1>S / cm, and solubility and stability are obviously improved; and the obtained composite material can be applied to the fields of super capacitors, sensor, solar cells and the like.

Description

technical field [0001] The invention relates to a method for preparing an N-substituted carboxylic acid polyaniline covalently grafted graphene composite material, which belongs to the technical field of conductive polymer materials. Background technique [0002] As a conductive polymer material, conductive polyaniline has important research value in the research of supercapacitor electrode materials, light-emitting diodes, and sensors due to its simple synthesis, unique doping mechanism, good conductivity, and high specific capacitance. The rigid structure of polyaniline leads to its poor solubility and processability, and the cycle stability during charge and discharge is not high, which limits its application. On the other hand, graphene, as a new type of carbon material, has also attracted extensive attention from researchers due to its excellent electrical conductivity, good cycle stability, and large specific surface area. The fly in the ointment is the stable six-memb...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K9/02C08K9/04C08K3/04
Inventor 章家立杨标高健陈爱喜
Owner EAST CHINA JIAOTONG UNIVERSITY
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