Preparation and Performance Characterization of Polyimide-based Graphite Films

Kunfeng Wang

doi:10.54097/bpk7ha35

Authors

Kunfeng Wang

DOI:

https://doi.org/10.54097/bpk7ha35

Keywords:

Polyimide, Chemical imidization, Carbonization, Graphitization, Thermal conductivity.

Abstract

With the large-scale application and high-speed operation of electronic devices, the problem of heat diffusion puts forward higher and higher requirements for effective heat dissipation materials. In this paper, chemical imidization is used to prepare polyimide (PI) films, and then carbonization and graphitization are carried out to prepare high thermal conductivity flexible graphite films. The results show that chemically imidized PI (CIPI) films have higher tensile strength, thermal stability and imidization degree than thermally imidized PI (TIPI) films. The graphite film prepared from CIPI film has a more complete crystal orientation and ordered arrangement. When the amount of chemical catalyst is 0.6%, the thermal conductivity of CIPI graphitized film is 1597 W·m−1·K−1. The high thermal conductivity is due to the large in-plane grain size and high crystal integrity. High-quality PI films can be preferentially prepared by the chemical imidization method, and then graphite films with excellent performance can be prepared.

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