|
| Preparation, High-temperature Structural Evolution and Thermal Conductivity of Polyimide Films |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2022.07.014 |
| KeyWord:polyimide graphite film carbonization graphitization thermal conductivity |
| Author | Institution |
| CHEN Zi-hao |
School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou , China |
| CAI Yun-fei |
School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou , China |
| ZHANG Teng-fei |
School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou , China |
| WANG Qi-min |
School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The paper aims to systematically study the microstructure evolution of polyimide (PI) films during carbonization and graphitization at high temperature and the influence mechanism of PI film thickness on the structure and thermal conductivity of the graphene films. Two kinds of polyimide (PI) films with different thickness were prepared by two-step method, and were further processed by high temperature carbonization, graphitization and calender to obtain graphite films with high thermal conductivity. The high temperature structure evolution and thermal conductivity of the films were systematically studied. The results showed that the thicknesses of PI films prepared by plate-coating method were 32 and 67.5 μm, respectively. After carbonization at 1 000 ℃, the film transformed from disordered structure to amorphous carbon, and turned into highly ordered graphite structure during graphitization at 2 800 ℃. After calender, the thicknesses of graphite film were 17 and 40 μm, respectively. It reduced the porosity and interlaminar spacing of graphite layers. In a certain range, thinner film led to easier removal of impurity elements and enhancement of graphitization, resulting in significantly improved in-plane thermal conductivity of the graphite film. The in-plane thermal conductivity of 17 μm graphite film can reach to 1 465 W/(m.K). |
| Close |
|
|
|