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Scanning electron microscope characterization method for graphene dispersibility in graphene polymer composite material

An electron microscope and alkene polymer technology, applied in the field of scanning electron microscopy, can solve the problems of difficult graphene position, uneven fracture, and dimples affecting the test effect, etc., achieve small stress, high sample flatness, and facilitate shape analysis The effect of the test

Inactive Publication Date: 2019-08-02
宁波新材料测试评价中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fracture obtained by this method is not smooth, and the dimples formed by the fracture will affect the test results, making it difficult to clearly and accurately determine the position of the graphene

Method used

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  • Scanning electron microscope characterization method for graphene dispersibility in graphene polymer composite material
  • Scanning electron microscope characterization method for graphene dispersibility in graphene polymer composite material
  • Scanning electron microscope characterization method for graphene dispersibility in graphene polymer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, graphene / polyimide is used as the composite material for testing; the mass percentage of graphene in the composite material is 0.5%.

[0043] Characterize the dispersion of graphene in the composite material to study whether graphene forms a conductive network in the composite material, which plays an important role in strengthening the conductive properties of the composite material.

[0044] The specific characterization method is as follows:

[0045](1) After preprocessing, the composite material is trimmed into a rectangular strip sample with a length of 20mm, and the radial dimension of the end face is 5mm×5mm; figure 1 As shown, use a blade to further trim one end of the sample along the length direction so that it is in the shape of a truncated cone, and the radial dimension of the tip surface is 1.6mm×1mm;

[0046] (2) Fix the tip of the sample upwards on the sample stage of a mechanical pusher ultramicrotome equipped with a microscope; adju...

Embodiment 2

[0056] In this embodiment, the composite material is exactly the same as that in Embodiment 1. Characterize the dispersion of graphene in the composite material to study whether graphene forms a conductive network in the composite material, which plays an important role in strengthening the conductive properties of the composite material.

[0057] The specific characterization method is basically the same as the characterization method of Example 1, except that in step (2), such as image 3 As shown, the tip surface of the sample is finally trimmed into a trapezoid with a lower base of 0.6 mm, an upper base of 0.4 mm, and a height of 0.3 mm.

[0058] SEM results were similar to Figure 5 As shown, it can be seen that the scanning electron microscope image is clearly visible, and the dispersion of graphene in the polyimide material can be seen intuitively.

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Abstract

The invention provides a scanning electron microscope characterization method for graphene dispersibility in a graphene polymer composite material. The method comprises the following steps: firstly, trimming a graphene high-polymer composite material to enable one end of the graphene high-polymer composite material along the length direction to be in a frustum shape, and enable the radial size ofa tip end surface of the graphene high-polymer composite material to be smaller than or equal to 0.5 mm; then, slicing the tip end by using a diamond cutter by adopting a mechanical propulsion type ultrathin slicing machine to obtain a composite material fracture; and finally, adhering a bottom end of a sample on an SEM sample table by using a conductive adhesive, enabling a fracture to face upwards, and connecting the sample table and the fracture surface by using the conductive adhesive to enable a conductive channel to be formed the fracture surface and the sample table for measurement. Byadopting the method, a scanning electron microscope image with a clear fracture of the composite material can be obtained, so that a clear, visual and accurate characterization of graphene dispersibility is realized.

Description

technical field [0001] The invention relates to the technical field of scanning electron microscopy, in particular to a method for characterizing the dispersion of graphene in a graphene polymer composite material. Background technique [0002] Graphene is carbon atoms with sp 2 The planar thin film of hexagonal lattice composed of hybridized orbitals has a theoretical thickness of only 0.35nm, which is the thinnest and highest strength among the known materials discovered so far. Graphene has a unique structure and excellent physical and chemical properties. Graphene has very good thermal conductivity. The thermal conductivity of single-layer graphene is as high as 5300W / mK, which is the carbon material with the highest thermal conductivity so far. The carrier mobility of graphene at room temperature is about 15000 cm 2 / (V·S), 10 times that of silicon material. Graphene is one of the materials with the highest strength known so far, and it also has good toughness. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2202G01N23/2251
CPCG01N23/2202G01N23/2251
Inventor 陈国新刘艳卢焕明李勇李明
Owner 宁波新材料测试评价中心有限公司
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