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Synthesis method of water dispersible polyaniline/graphene composite material

A technology of composite materials and graphene, which is applied in the field of preparation of polyaniline/graphene composite materials, can solve problems such as poor processing performance, easy accumulation and agglomeration, and difficult application, so as to achieve good processing performance, avoid agglomeration, good application prospects and The effect of economic benefits

Inactive Publication Date: 2012-06-13
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patents CN101781459A and CN101781458A prepared polyaniline / graphene composite materials by in-situ polymerization of aniline on graphene oxide and then reduction in water or organic solvents. The material has better electrochemical properties than single-component materials. However, due to the poor solubility of graphene and polyaniline in the composite, and the strong π-π interaction between graphene and polyaniline will lead to easy accumulation and agglomeration, these all lead to the reported polyaniline / graphene composite material Difficult to disperse in water, poor processing performance, causing great difficulties to its further application

Method used

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  • Synthesis method of water dispersible polyaniline/graphene composite material
  • Synthesis method of water dispersible polyaniline/graphene composite material
  • Synthesis method of water dispersible polyaniline/graphene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0017] 1. Preparation of graphene by heating reduction with hydrazine

[0018] Put 1.0g of graphite oxide into a 500mL round-bottomed flask, add 250mL of distilled water, at this time an inhomogeneous brown dispersed phase appears, ultrasonically vibrate for 30min in an ultrasonic disperser; add hydrazine hydrate (10mL), and release the solution Heat the reaction at 100°C in an oil bath for 24 h; then alternately wash with distilled water and absolute ethanol and centrifuge for more than 10 times.

[0019] 2. Preparation of water-dispersed polyaniline / graphene composites containing 30wt% graphene

[0020] Put 100 mg of graphene in a beaker, add 1 g of polystyrenesulfonic acid, 5 mL of DMF and 20 mL of water, and stir to obtain a graphene dispersion. Add 0.23 g of aniline monomer to the graphene dispersion, pass nitrogen gas for about 30 minutes, and stir in an ice bath. Then add 0.57g of ammonium persulfate to the mixture, and react in ice bath for 6h. After centrifuging, w...

Embodiment 2

[0022] 2. prepare graphene (GR) by hydrazine heating reduction: same as embodiment 1 step 2

[0023] 3. Preparation of water-dispersed polyaniline / graphene composite material containing 50wt% graphene

[0024] Put 100 mg of graphene in a beaker, add 1 g of polyvinylpyrrolidone, 3 mL of DMSO and 20 mL of water, and stir to obtain a graphene dispersion. Add 0.10 g of aniline monomer to the graphene dispersion, pass nitrogen gas for about 30 minutes, and stir in an ice bath. Then add 0.25g of ammonium persulfate to the mixture, and react in ice bath for 6h. After centrifuging, washing, and dissolving in water, a water-dispersed polyaniline / graphene composite material can be obtained.

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Abstract

Belonging to the field of composite material preparation, the invention provides a preparation method of a polyaniline / graphene composite material able to disperse in water stably. The material is prepared by the following steps of: 1) reducing graphene oxide to graphene with hydrazine hydrate; 2) dispersing the newly prepared graphene in a solution containing a macromolecular dispersant; 3) then adding aniline for dispersing; 4) at a low temperature, adding a solution of an oxidizing agent and an inorganic acid into the obtained mixed solution dropwisely, and conducting stirring for polymerization; and 5) carrying out centrifugation and washing, thus obtaining the polyaniline / graphene composite material. Due to the auxiliary effect of the macromolecular dispersant, the polyaniline / graphene composite material obtained in the invention can disperse uniformly in water and can be stored stably. And the obtained dispersed solution generates no sediment after 6 months of placement. Thus, the method of the invention solves the problem of difficult processing of a polyaniline / graphene composite material.

Description

Technical field: [0001] The invention relates to an organic-inorganic conductive composite material, in particular to a method for preparing a polyaniline / graphene composite material that can be stably dispersed in water, which improves the processing performance of the polyaniline / graphene composite material. Background technique: [0002] Polyaniline (PANI) has become a research hotspot in the field of conductive polymers due to its cheap raw materials, easy synthesis, diverse structures, stability in the air, and special doping mechanism. Polymers have broad application prospects in supercapacitors, chemical power sources, antistatic, electrochromic, electromagnetic shielding, biological and chemical sensors, etc. However, due to the strong rigidity of polyaniline chains and the strong interaction between chains, its solubility is extremely poor, and its processability is correspondingly poor, which limits its wide application. [0003] Graphene has the advantages of spe...

Claims

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Application Information

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IPC IPC(8): C08L79/02C08K3/04C08G73/02
Inventor 罗静姜思思吴海强邬勇刘晓亚
Owner JIANGNAN UNIV
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