Graphene/polyimide composite membrane and preparation method thereof

A composite film and polyimide technology, applied in the field of graphene/polyimide composite film and its preparation, can solve the problems of poor mechanical properties and flexibility, low thermal conductivity of graphite film, etc., and achieve good bending resistance Performance, high thermal conductivity, good flexibility effect

Active Publication Date: 2017-11-24
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a graphene / polyimide composite film in order to solve technical problems such as low thermal conductivity, poor mechanical properties and flexibility of the above-mentioned graphite film, and the graphene / polyimide composite film Has high thermal conductivity and good flexibility and bending resistance

Method used

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  • Graphene/polyimide composite membrane and preparation method thereof
  • Graphene/polyimide composite membrane and preparation method thereof
  • Graphene/polyimide composite membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A kind of preparation method of graphene / polyimide composite film specifically comprises steps as follows:

[0052] (1) Control the power to 300W and ultrasonicate for 10 minutes at a frequency of 40kHz to dissolve 4,4'-diaminodiphenyl ether and pyromellitic dianhydride in N,N-dimethylformamide respectively to obtain 4, 4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution;

[0053] Then, add graphene oxide powder to the 4,4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution obtained above, and then use 300W power and 40kHz ultrasonic wave for 30min to make the graphene oxide uniform dispersed in 4,4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution to obtain graphene oxide / pyromellitic dianhydride mixed solution and graphene oxide / 4,4'-diamino diphenyl ether solution;

[0054] In the above graphene oxide / 4,4'-diaminodiphenyl ether solution, the amount of 4,4'-diaminodiphenyl ether, graphene oxide powder and N,N...

Embodiment 2

[0064] A kind of preparation method of graphene / polyimide composite film specifically comprises steps as follows:

[0065] (1) Control the power to 300W and ultrasonicate for 10 minutes at a frequency of 40kHz to dissolve 4,4'-diaminodiphenyl ether and pyromellitic dianhydride in N,N-dimethylformamide respectively to obtain 4, 4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution;

[0066] Then, add graphene oxide powder to the 4,4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution obtained above, and then use 300W power and 40kHz ultrasonic wave for 30min to make the graphene oxide uniform dispersed in 4,4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution to obtain graphene oxide / pyromellitic dianhydride mixed solution and graphene oxide / 4,4'-diamino diphenyl ether solution;

[0067] In the above graphene oxide / 4,4'-diaminodiphenyl ether solution, the amount of 4,4'-diaminodiphenyl ether, graphene oxide powder and N,N...

Embodiment 3

[0077] A kind of preparation method of graphene / polyimide composite film specifically comprises steps as follows:

[0078] (1) Control the power to 300W and ultrasonicate for 10 minutes at a frequency of 40kHz to dissolve 4,4'-diaminodiphenyl ether and pyromellitic dianhydride in N,N-dimethylformamide respectively to obtain 4, 4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution;

[0079] Then, add graphene oxide powder to the 4,4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution obtained above, and then use 300W power and 40kHz ultrasonic wave for 30min to make the graphene oxide uniform dispersed in 4,4'-diaminodiphenyl ether solution and pyromellitic dianhydride solution to obtain graphene oxide / pyromellitic dianhydride mixed solution and graphene oxide / 4,4'-diamino diphenyl ether solution;

[0080]In the above graphene oxide / 4,4'-diaminodiphenyl ether solution, the amount of 4,4'-diaminodiphenyl ether, graphene oxide powder and N,N-...

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Abstract

The invention discloses a graphene/polyimide composite membrane and a preparation method thereof. According to the preparation method, in-situ polymerization is carried out on polyimide in graphene to enable dispersion between the graphene and the polyimide to be relatively uniform, bonding between the graphene and the polyimide to be relatively tight and the polyimide to be used for more fully welding a graphene sheet layer, membrane gaps are filled, and the graphene/polyimide composite membrane with the thickness being 3-8 microns, good flexibility and excellent heat conduction performance is prepared, wherein preferably, the thermal conductivity of the membrane can reach 1176.46-1545.57W.m<-1>.K<-1>, the membrane can be repeatedly bent for 400 times, and the resistance ratio of the membrane is smaller than 1.1. According to the preparation process, the graphene/polyimide acid composite membrane is prepared by utilizing an interface self-assembly method firstly, and then imidizing, carbonizing and graphitizing a graphene oxide/polyimide acid composite membrane to obtain the graphene/polyimide composite membrane finally. The composite membrane can be widely applied to solving the heat dissipation problem in the field of portable wearable electronic equipment, flexible electronic devices and the like.

Description

technical field [0001] The invention relates to a preparation technology of a heat-conducting film, in particular to a graphene / polyimide composite film and a preparation method thereof. Background technique [0002] Graphene is a single layer of carbon atoms in a two-dimensional honeycomb lattice structure, which has excellent thermal conductivity, mechanical properties and good flexibility. Since 2004, when the research group of the University of Manchester in the United Kingdom obtained stable graphene for the first time, graphene has quickly become a hotspot in the research fields of materials science and condensed matter physics. At present, the thermal conductivity in the suspended single-layer graphene sheet has been measured experimentally to be 5300 W m -1 ·K -1 , with a Young's modulus of 1000 GPa and a mechanical strength of 125 GPa. Therefore, graphene has a very broad application prospect in engineering thermal management as a thermally conductive film, therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/04C08G73/10
CPCC08G73/105C08J5/18C08J2379/08C08K3/04C08L79/08
Inventor 杨俊和李昊亮苗洁吴限
Owner UNIV OF SHANGHAI FOR SCI & TECH
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