Preparation method of modified graphene oxide/PMMA composite material

A technology of composite materials and stone oxide, which is applied in the field of preparation of modified graphene oxide/PMMA composite materials, can solve the problems of incomplete exfoliation and poor dispersion of graphene oxide, and achieve increased resistivity, improved dispersion, and improved dispersion sexual effect

Active Publication Date: 2017-09-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the technical problems of incomplete exfoliation of graphene oxide and poor dispersion in the matrix in the preparation process of the existing graphene oxide / polymer composite material, and provides a preparation of modified graphene oxide / PMMA composite material Method, the specific preparation process steps are as follows:

Method used

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  • Preparation method of modified graphene oxide/PMMA composite material
  • Preparation method of modified graphene oxide/PMMA composite material
  • Preparation method of modified graphene oxide/PMMA composite material

Examples

Experimental program
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Embodiment 1

[0023] (1) Graphene oxide was prepared by improving the Hummers method: 1 g of graphite powder, 0.5 g of sodium nitrate, and 23 ml of concentrated sulfuric acid were stirred in an ice bath for 30 min, and 3 g of potassium permanganate was slowly added in batches within 1 h for low-temperature reaction. After the end, heat up to 35°C for medium-temperature reaction. After the end, add 50ml of distilled water, quickly raise the temperature to 95°C and enter the high-temperature reaction for 0.5 hours, stop heating, add 100ml of distilled water and 10ml of hydrogen peroxide in batches, let stand and centrifuge, and prepare a mass fraction of 5%. Hydrochloric acid solution, distilled water wash and freeze-dry 24h to obtain graphene oxide;

[0024] Experiments have proved that the graphene oxide prepared by the above improved Hummers method has a high degree of oxidation and good dispersion in water. figure 1 It can be seen that compared with graphite powder, graphene oxide has a w...

Embodiment 2

[0031](1) improve Hummers method to prepare graphene oxide method with embodiment 1;

[0032] (2) the preparation of aminated graphene oxide is the same as in Example 1;

[0033] (3) Preparation of modified graphene oxide surface grafted with polymethyl methacrylate: take 0.035g of GO-ODA obtained in step (2), ultrasonically disperse it in 5.0ml monomer MMA, and then add 0.35 g BPO in toluene, in N 2 React at 60°C for 5 hours under protection, centrifuge, wash, dry and disperse in THF;

[0034] (4) Take by weighing 7.0g PMMA pellets and be dissolved in THF, the graphene oxide surface grafting polymethyl methacrylate 0.035g obtained in (3) is dispersed in THF to obtain mixed solution, add the THF that is dissolved in PMMA dropwise In the solution, the PMMA composite material was obtained by casting film on a polytetrafluoroethylene plate.

Embodiment 3

[0036] (1) improve Hummers method to prepare graphene oxide method with embodiment 1;

[0037] (2) the preparation of aminated graphene oxide is the same as in Example 1;

[0038] (3) Preparation of modified graphene oxide surface grafted with polymethyl methacrylate: take 0.035g of GO-ODA obtained in step (2), ultrasonically disperse it in 5.0ml monomer MMA, and then add 0.70 g BPO in toluene, in N 2 React at 60°C for 5 hours under protection, centrifuge, wash, dry and disperse in THF;

[0039] (4) Take by weighing 7.0g PMMA pellets and be dissolved in THF, the graphene oxide surface grafting polymethyl methacrylate 0.035g obtained in (3) is dispersed in THF to obtain mixed solution, add the THF that is dissolved in PMMA dropwise In the solution, the PMMA composite material was obtained by casting film on a polytetrafluoroethylene plate.

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Abstract

The invention discloses a preparation method of a modified graphene oxide / PMMA composite material. The preparation method of the modified graphene oxide / PMMA composite material comprises the following steps: preparing graphene oxide; performing reaction on the graphene oxide and 4,4-diaminodiphenyl ether to prepare aminated graphene oxide; mixing the aminated graphene oxide with a methyl methacrylate monomer, adding a toluene solution of dibenzoyl peroxide to obtain graphene oxide grafted polymethyl methacrylate, drying the graphene oxide grafted polymethyl methacrylate and dispersing the graphene oxide grafted polymethyl methacrylate into tetrahydrofuran; and blending the solution with a pure polymethyl methacrylate solution, and casting a film to obtain the modified graphene oxide / PMMA composite material. A redox initiation system is used for successfully initiating polymerization of methyl methacrylate on the surface of the graphene oxide, and simple solutions are blended to prepare the modified graphene oxide / PMMA composite material; and the modified graphene oxide has high dispersibility in the composite material, and the thermal performance of the material is improved to a certain extent under the condition of low adding amount.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a preparation method of a modified graphene oxide / PMMA composite material. Background technique [0002] The structure of graphene is a closely arranged hexagonal honeycomb lattice, in which the carbon atoms are sp 2 Hybrid orbitals are formed by covalent bonds. It is precisely because of such a special crystal structure of graphene that it has excellent electrical properties, mechanical properties, and thermal properties. Pure graphene is composed of stable six-membered rings, which is chemically inert, easy to agglomerate, and dispersed in other media The property is very poor, which brings certain difficulties to the application research of graphene, and the derivative of graphene, graphene oxide, is not much different from the structure of graphene, and graphene oxide is also a two-dimensional layered structure, due to the preparation Strong oxidation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L51/10C08F292/00C08F220/14
CPCC08F292/00C08L33/12C08L2201/08C08L51/10C08F220/14
Inventor 张洪文汤玉莹姜彦蒋姗丁永红俞强
Owner CHANGZHOU UNIV
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