Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (3): 663-673.doi: 10.13229/j.cnki.jdxbgxb.20221525

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Thermal conductivity and electrical insulation properties of fluorographene/polyimide composite films

Chao YANG1(),Qing-yun YAO2,Shuang-mei TANG2,Qi-long CHEN3,Feng QIN3   

  1. 1.Research Center for Inorganic Nanopowder and Application Engineering，Guilin University of Technology，Guilin 541004，China
    2.Chief Engineer's Office，Guangxi Road Construction Engineering Group Co. ，Ltd. ，Nanning 530001，China
    3.College of Road and Bridge Engineering，Guangxi Institute of Communications Technology，Nanning 530023，China
  • Received:2022-11-29 Online:2024-03-01 Published:2024-04-18

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Abstract:

In order to improve the thermal conductivity and electrical insulation properties of polyimide matrix composites， fluorographene nanosheets were prepared by ultrasonic exfoliation process， and fluorographene/polyimide composite films with horizontal directional thermal conductivity characteristics were prepared by hot-pressing induced orientation process. The results show that increasing the amount of fluorinated graphene can improve the in-plane thermal conductivity of the composite film. When the mass fraction of fluorinated graphene is 30%， the in-plane thermal conductivity of the composite film is 2.4 W/（m·K）. When the amount of fluorinated graphene increases， the DC withstand voltage performance of the composite film slightly decreases， but the electrical tracking resistance of the composite film increases due to the improved phonon transfer efficiency in the composite film. The above research results can provide reference for the preparation of composite films with high thermal conductivity and high electrical insulation performance.

Key words: composite material, fluorinated graphene, polyimide, thermal conductivity characteristics, electrical insulation performance

CLC Number: 

  • TB383

Fig.1

Schematic diagram of synthesis of F-graphene/PI composite film"

Fig.2

Experimental flatform of the tracking failure and DC flashover voltage"

Fig.3

TEM morphology of F-graphene nano-sheets"

Fig.4

Raman of graphite fluoride and F-graphene nano-sheets"

Fig.5

XPS spectrum of graphite fluoride and F-graphene nano-sheets"

Fig.6

XRD of F-graphene nano-sheets"

Fig.7

TGA curve of F-graphene nano-sheets"

Fig.8

SEM morphology of F-graphene/PI composite films"

Fig.9

Thermal conductivities of F-graphene/PI composite films"

Fig.10

TGA curves of F-graphene/PI composite films"

Fig.11

Conductivities of F-graphene/PI composite films"

Fig.12

Effects of F-graphene contents on DC flashover voltages of composite films"

Fig.13

Effects of F-graphene contents on traces of insulation failure of composite films"

Fig.14

Stress-strain curves of insulation failure of composite films"

Fig.15

Water contact angles of insulation failure of composite films"

Fig.16

Thermal conduction paths of F-graphene/PI composite films"

Fig.17

Platform and test results of surface potential decay characteristics of composite films with different F-graphene contents"

Table 1

Effects of F-graphene contents on surface trap characteristics of composite films"

试样浅陷阱能级/eV

浅陷阱密度/

（1036 m-3）

深陷阱能级/eV

深陷阱密度/

（1036 m-3）

F-graphene/PI-100.81639.950.85936.02
F-graphene/PI-150.804311.800.85825.51
F-graphene/PI-200.793511.570.84205.21
F-graphene/PI-300.759911.610.83034.92
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