Preparation method for polymer grafted graphene oxide

A graphene and polymer technology, applied in the field of preparation of inorganic-organic hybrid materials, can solve the problems of high price, difficulty, and difficulty in removing organic solvents, and achieve the effects of simple steps, safe reaction, and easy control.

Inactive Publication Date: 2012-06-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above preparation methods have the following problems: (1) It is very difficult to prepare graphene in large quantities at present, because the existing methods for preparing graphene mainly include: chemical vapor deposition, micromechanical exfoliation of graphite, and epitaxial growth on the surface of an insulator; but These three methods are expensive and cannot prepare graphene in large quantities; (2) Due to the lack of active centers on the surface of graphene, it is difficult to prepare hybrid materials with excellent properties with polymers.
However, the above-mentioned preparation method is

Method used

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  • Preparation method for polymer grafted graphene oxide

Examples

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Effect test

Embodiment 1

[0032] A preparation method for polymer-grafted graphene oxide, comprising the steps of:

[0033] (1) At first graphite is pre-oxidized with phosphorus pentoxide, specifically graphite powder 5g, phosphorus pentoxide 1g; After reacting for 24 hours, filter and wash, and vacuum dry to obtain black pre-oxidized graphite powder;

[0034] (2) Add pre-oxidized graphite (5g) into concentrated sulfuric acid (100mL) and potassium permanganate (5g) in turn and stir for 2 hours, then slowly add 140mL of water into the above mixed solution (note that the solution is exothermic in large amounts at this time, and it takes There are protective measures), after adding water, continue to stir for 2 hours, then centrifuge to wash away manganese ions and acid; vacuum dry to obtain a tan product (that is, graphene oxide);

[0035] Test proves, the water solubility of above-mentioned product is very good; By figure 1 It can be seen that the graphene oxide aqueous solution has an ultraviolet abso...

Embodiment 2

[0041] A preparation method for polymer-grafted graphene oxide, comprising the steps of:

[0042] (1) Graphene oxide preparation method is with above-mentioned embodiment one;

[0043] (2) Utilize tetravalent cerium salt to graft polyacrylamide on the surface of graphite oxide;

[0044] The specific experimental steps are: equipped with mechanical stirring, reflux condenser and N 2 Add the above-mentioned graphene oxide (0.2g) and acrylamide monomer (2mL) into the three-necked reaction flask of the catheter, heat to 40 degrees, and pass N 2 After 15 minutes, the nitric acid solution of ammonium cerium nitrate was added dropwise, and the 2 Continue to stir for 1 to 5 hours;

[0045] After the reaction is over, since the polymer is insoluble in water, the successfully grafted product will precipitate out of water, filter the precipitate, and wash with water and ethanol in turn to remove unreacted monomers, trivalent, and tetravalent Cerium ions, etc.; finally, the grafted p...

Embodiment 3

[0047] A preparation method for polymer-grafted graphene oxide, comprising the steps of:

[0048] (1) Graphene oxide preparation method is with above-mentioned embodiment one;

[0049] (2) Utilize tetravalent cerium salt to graft polyacrylonitrile on the surface of graphite oxide;

[0050] The specific experimental steps are: equipped with mechanical stirring, reflux condenser and N 2 Add the above-mentioned graphene oxide (0.2g) and acrylonitrile monomer (2mL) into the three-necked reaction flask of the catheter, heat to 35 degrees, and pass N 2 After 15 minutes, the nitric acid solution of ammonium cerium nitrate was added dropwise, and the 2 Continue to stir for 1 to 5 hours;

[0051] After the reaction is over, since the polymer is insoluble in water, the successfully grafted product will precipitate out of water, filter the precipitate, and wash with water and ethanol in turn to remove unreacted monomers, trivalent, and tetravalent Cerium ions, etc.; finally, the gra...

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Abstract

The invention discloses a preparation method for polymer grafted graphene oxide. The method comprises the following steps: (1) carrying out pre-oxidation on graphite by using phosphorus pentoxide to obtain pre-oxidized graphite; (2) adopting potassium permanganate and concentrated sulfuric acid to oxidize the pre-oxidized graphite, and washing to obtain graphene oxide with hydroxyl on the surface; (3) mixing the graphene oxide with the hydroxyl on the surface and an alkene monomer, heating and introducing nitrogen, adding a tetravalent cerium ion-containing solution in a dropwise manner, carrying out a reaction for 1-6 hours while stirring under the case of nitrogen introducing, and carrying out treatments of filtering, washing and drying to obtain the polymer grafted graphene oxide. According to the present invention, a new method for preparing the polymer grafted graphene oxide is developed; the polymer grafted with the graphene oxide on the surface is obtained with one step through the redox polymerization method based on the graphene oxide, such that the steps are convenient, the reaction is safe, the environmental protection is achieved, and the efficiency is high.

Description

technical field [0001] The invention relates to a preparation method of polymer-grafted graphene oxide, which belongs to the field of preparation of inorganic-organic hybrid materials. Background technique [0002] Graphene is a new two-dimensional nanomaterial with a thickness of one atom, which has attracted much attention in recent years. It is reported to have a Young's modulus of 1,100 GPa, a fracture stress of 125 GPa, and a thermal conductivity of 5,000 Wm -1 K -1 , with a charge carrier mobility of 200,000 cm 2 V -1 S -1 , with a specific surface area of ​​2,630 m 2 g -1 . Therefore, both its theory and its experimental results show that the single-layer two-dimensional graphene sheet is the material with the highest mechanical strength found so far. In addition, this new class of materials has high electrical and thermal conductivity, stiffness, and high aspect ratio. Therefore, it has broad application prospects in the fields of transistors, supercapacitor...

Claims

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Application Information

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IPC IPC(8): C08F292/00
Inventor 屠迎锋杨晓明马丽君朱秀林李耀文
Owner SUZHOU UNIV
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