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Method for preparing polyethylene/graphene conductive composite material

A technology of conductive composite materials and graphene, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of increased percolation threshold and poor dispersion effect of composite materials, achieve high conductivity and reduce agglomeration Effect

Inactive Publication Date: 2012-07-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the poor dispersion effect of the composite material in the prior art, which causes the defect that the percolation threshold value increases

Method used

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  • Method for preparing polyethylene/graphene conductive composite material
  • Method for preparing polyethylene/graphene conductive composite material
  • Method for preparing polyethylene/graphene conductive composite material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] Embodiment 1 The preparation process condition of preferred polyethylene / graphene conductive composite material

[0034] Using ultra-high molecular weight polyethylene powder with a molecular weight of 3 million as raw material, the preparation of polyethylene / graphene conductive composite material can be divided into two steps, the first step is the preparation of polyethylene powder coated with graphene oxide, and the second step is to polymerize The graphene oxide on the surface of the ethylene particles is reduced to graphene.

[0035] In the first step, 85mg of graphene oxide is placed in 400mL of water and ethanol in a solvent with a mass ratio of 50:1, and after being dispersed in an ultrasonic cleaner for 2 hours, 20g of ultra-high molecular weight polyethylene powder is added to the solution , with mechanical stirring at 95°C, when a large amount of solvent evaporated, dry in an oven at 80°C for 24 hours, and then continue drying in a vacuum oven at 95°C for 24...

Embodiment 2

[0041] Embodiment 2 The scope of application of the ratio of raw materials for preparing polyethylene / graphene conductive composite material

[0042] The graphene oxide raw material consumption in embodiment 1 is replaced by 10mg, 21.6mg, 46.6mg, 163.3mg, 238.3mg or 318.3mg, the steps and conditions of preparing polyethylene / graphene conductive composite material are the same as embodiment 1, all Can implement the present invention, prepare the flaky polyethylene / graphene conductive composite material that graphene content is respectively 0.01vol%, 0.028vol%, 0.06vol%, 0.2vol%, 0.3vol%, 0.4vol%; The electrical conductivity of ethylene / graphene conductive composites in units of s / cm is 1.6×10 -7 , 2×10 -4 , 0.0031, 0.018, 0.038, 0.045.

[0043] The implementation effect can be found in Figure 4 and Figure 9 .

Embodiment 3

[0044] Example 3 The scope of application of the process conditions for preparing polyethylene / graphene conductive composites

[0045] The steps for preparing the polyethylene / graphene conductive composite material are the same as in Example 1. In the first step in Example 1, the dispersion in the ultrasonic cleaner was replaced for 3 hours, and the polyethylene powder was added and mechanically stirred at 90 ° C. It was also possible to obtain a polymer powder coated with a layer of graphene oxide. Composite particles with a shell-core structure.

[0046] Alternatively, the steps for preparing the polyethylene / graphene conductive composite material are the same as in Example 1. In the second step in Example 1, the mass ratio of hydrazine hydrate and the composite particles of the core-shell structure is 8: 10, heated to 90 ° C and carried out mechanical stirring for 6 hours, the graphene oxide on the polymer can also be reduced into graphene, produced

[0047] That is, the...

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Abstract

The invention relates to a method for preparing a polyethylene / graphene conductive composite material, and belongs to the technical field of preparation of composite conductive polymer materials. The method comprises the following steps of: putting graphite oxide into a solvent consisting of water and ethanol, performing ultrasonic dispersion, adding polyethylene powder, and performing mechanicalstirring; evaporating the solvent, and drying in vacuum to remove the residual solvent so as to obtain core-shell structured composite particles in which the polyethylene powder is coated with a layer of graphene oxide; and adding the core-shell structured composite particles into a hydrazine hydrate solution, heating and stirring, and reducing the graphene oxide on polymer into graphene so as toobtain the powdered polyethylene / graphene conductive composite material. By the method, the graphene oxide can be effectively and uniformly coated on the surface of the polymer; the graphene does notfall into the solution in the reduction process, and the agglomeration of a final product, namely the graphene is effectively reduced; and a platy composite material prepared by hot pressing has a low percolation threshold value and high electric conductivity.

Description

technical field [0001] The invention belongs to the technical field of composite conductive polymer material preparation, in particular to a preparation method of polymer and graphene composite material. Background technique [0002] Composite conductive polymer materials are widely used in the fields of optoelectronic devices, energy, self-control heating elements, and antistatic. The usual composite conductive polymer is to add conductive fillers such as carbon black, graphite or metal powder into single-phase or multi-phase polymer to prepare a polymer-based composite material with conductive function. With the increase of conductive filler, the polymer composite will undergo a transformation from an insulator to a conductor, that is, the phenomenon of percolation. In order to obtain higher electrical conductivity, it is usually necessary to add high volume fillers to the polymer matrix, such as carbon black-filled polymers generally need to add 5% to 20% volume fraction...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K3/04H01B1/24
CPCC08J3/124
Inventor 郑伟涛赵竹第胡洪亮文懋刘钦铭
Owner JILIN UNIV
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