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High-conductivity polyimides-graphene composite material and preparation method thereof

A technology of polyimide and high conductivity, which is applied in the field of high conductivity polyimide-graphene composite materials and its preparation, and can solve the problems of difficult dispersion of graphene, high percolation threshold, cumbersome process, etc. , to achieve the effect of simple and practical molding method, high electrical conductivity and simplified process

Active Publication Date: 2016-01-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art mainly has the following disadvantages: (1) In order to uniformly disperse graphene in the polymer matrix, graphene needs to be modified, and the introduction of functional groups will destroy the regularity of graphene and reduce the density of graphene. Electrical conductivity, in addition, the thermal stability of functional groups is generally poor, which will reduce the thermal stability of polyimide; (2) in-situ compounding or solution compounding requires a large amount of solvent, the process is cumbersome, the cost is high, and it is not conducive to environmental protection; ( 3) Using melt blending, graphene is difficult to effectively disperse, and the electrical conductivity of the composite material is poor
However, the composite material prepared by this invention still has the disadvantage of high percolation threshold

Method used

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  • High-conductivity polyimides-graphene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Add 0.6 g of self-made polyimide microspheres into a 100 ml single-necked flask, add 54 g of deionized water, stir and disperse evenly, and obtain a dispersion of polyimide microspheres. Add 0.6 mg of self-made graphene oxide (see: Journal of the American Chemical Society 1958; 80:1339 for specific preparation method) into 6 g of deionized water, and ultrasonically disperse for 1 hour to obtain a graphene oxide dispersion. Then the graphene oxide dispersion was slowly added to the polyimide microsphere dispersion, and stirred at 25° C. for 1 h to obtain a graphene oxide-coated polyimide microsphere dispersion. Next, 0.02 g of hydrazine hydrate was added to the solution, and the reaction solution was heated to 90° C. for 24 hours of reaction. Centrifuged and washed 3 times to obtain polyimide microspheres coated with reduced graphene oxide.

[0041] Wherein, the preparation method of polyimide microsphere is as follows:

[0042] (1) Add polyimide to N,N-dimethylacetamid...

Embodiment 2

[0050] Add 0.6 g of self-made polyimide microspheres into a 100 ml single-necked flask, add 48 g of deionized water, stir and disperse evenly, and obtain a dispersion of polyimide microspheres. Add 1.2 mg of self-made graphene oxide into 6 g of deionized water, and ultrasonically disperse for 1 hour to obtain a graphene oxide dispersion. Then the graphene oxide dispersion was slowly added to the polyimide microsphere dispersion, and stirred at 25° C. for 1 h to obtain a graphene oxide-coated polyimide microsphere dispersion. Next, 0.04 g of hydrazine hydrate was added to the solution, and the reaction solution was heated to 90° C. for 24 hours of reaction. Centrifuged and washed 3 times to obtain polyimide microspheres coated with reduced graphene oxide.

[0051] Scanning electron microscopy showed that the surface of the microspheres was slightly coated with a layer of graphene, and the intensity of the PI characteristic peak on the Raman spectrum peak was weakened.

[0052...

Embodiment 3

[0054] Add 0.6 g of self-made polyimide microspheres into a 100 ml single-necked flask, add 42 g of deionized water, stir and disperse evenly, and obtain a dispersion of polyimide microspheres. Add 1.8 mg of self-made graphene oxide into 18 g of deionized water, and ultrasonically disperse for 1 hour to obtain a graphene oxide dispersion. Then the graphene oxide dispersion was slowly added to the polyimide microsphere dispersion, and stirred at 25° C. for 1 h to obtain a graphene oxide-coated polyimide microsphere dispersion. Next, 0.05 g of hydrazine hydrate was added to the solution, and the reaction solution was heated to 90° C. for 24 hours of reaction. Centrifuged and washed 3 times to obtain polyimide microspheres coated with reduced graphene oxide.

[0055] Scanning electron microscopy showed that the surface of the microspheres was slightly coated with a layer of graphene, and the intensity of the PI characteristic peak on the Raman spectrum peak was weakened.

[005...

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Abstract

The invention discloses a high-conductivity polyimides-graphene composite material and a preparation method thereof. The preparation method comprises: taking polyimides microballoon subjected to none modification and graphene oxide as raw materials, firstly preparing a polyimides / graphene oxide core-shell composite microballoon, then employing a chemical reduction process to obtain a polyimides / reduced graphene oxide core-shell composite microballoon, and finally performing hot-pressing molding on the polyimides / reduced graphene oxide core-shell composite microballoon, so as to obtain the high-conductivity polyimides-graphene composite material. The preparation method is simple in technology, environment-friendly and free of pollution, and the prepared composite material is high in conductivity, and suitable for industrialized large-scale production.

Description

technical field [0001] The invention relates to the technical field of polymer composite material and its preparation. Specifically relates to a polyimide-graphene composite material with high electrical conductivity and a preparation method thereof. Background technique [0002] Polyimide (PI) is a class of aromatic polymers containing imide rings. It has the characteristics of high temperature resistance, corrosion resistance and excellent mechanical properties. It is widely used in microelectronic devices, aerospace, automobile manufacturing, gas separation, Adhesives and other fields. In special fields such as electronic devices and aerospace, polyimide materials are required to have antistatic or electromagnetic shielding properties. [0003] Graphene (GNPs) is a carbon material with a planar two-dimensional structure, which has excellent electrical and thermal conductivity (its zero-broadband carrier mobility is 200,000 cm 2 v -1 the s -1 , the thermal conductivit...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K3/04
CPCC08K3/04C08K2201/003C08K2201/006C08L79/08
Inventor 方省众徐禄波王玮陈国飞
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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