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| Effects of Polymerization Time on the Microstructure and Properties of PI-based Carbon Films |
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| DOI：10.7643/issn.1672-9242.2022.08.013 |
| KeyWord:polyimide graphite film polymerization time 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 |
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| Abstract: |
| The purpose of this paper is to systematically study the effect of precursor polymerization time on the structure and properties of PI films and their carbonized and graphitized films. In this paper, by adjusting the reaction time in the polymerization process of polyamic acid (PAA) solution, the polyimide (PI) original films were prepared, which were the precursor of graphite films. The PI films prepared under different process conditions were carbonized and graphitized to obtain high thermal conductivity graphite films. The microstructure and thermal conductivity of PI films, carbon films and graphite films were measured by SEM, FTIR Spectrometer, Raman Spectrometer and LFA laser flash analyzer. The results show that with the increase of polymerization time, the degree of imidization of PI films, the degree of graphitization and the thermal conductivity of graphite films first increased and then decreased. When the reaction time was 3 h, the graphite film prepared had the most compact structure, good orientation of graphite sheet and the best thermal conductivity, with the thermal conductivity could reach to 765.2 W/(m.K). The polymerization time of PI film precursor significantly affects the imimidedegree and order of PI film, and then affects the orientation and thermal conductivity of the graphite film. |
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