Table 1
Main properties of PI (GCTPTM)
| Density (kg/m3) | 1,350 |
|---|---|
| Impact strength (kJ/m2) | 25 |
| Tensile Strength (MPa) | 95 |
| Thermal expansion coefficient (°C−1) | 4.8 × 10−5 |
| Elongation at break (%) | 7 |
| Tg (°C) | 260 |
| Flexural strength (MPa) | 150 |
| Thermal decomposition temperature (°C) | 240 |
[i] Tg, glass transition temperature; PI, polyimide.
Fig. 1
Preparation process of CF/PI composites by heat treatment. CF, carbon fiber; PI, polyimide
Fig. 2
The variations of temperature and pressure with time
Fig. 3
The effect of CF mass fraction on the surface resistivity of CF/PI and O3-treated CF/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation
Fig. 4
FTIR spectrum of CF and O3-treated CF: (A) CF; (B) O3-treated CF. CF, carbon fiber; FTIR, Fourier-transform infrared
Fig. 5
SEM photos of (A) CF/PI and (B) O3-treated CF/PI composites. CF, carbon fiber; PI, polyimide; SEM, scanning electron microscopy
Table 2
Surface roughness results by AFM
| Type | Surface roughness (nm) |
|---|---|
| CF | 30.7 |
| O3-treated CF | 42.9 |
[i] AFM, atomic force microscopy; CF, carbon fiber
Fig. 6
The effect of CF mass fraction on the tensile strength of CF/PI and O3-treated CF/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation
Fig. 7
The effect of CF mass fraction on the impact strength of CF/PI and O3-treated CF/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation
Fig. 8
The SEM image of the CF/PI composite when the CF mass fraction is 15%. CF, carbon fiber; PI, polyimide; SEM, scanning electron microscopy
Fig. 9
The effect of MXene content on the surface resistivity of CF/MXene/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation
Fig. 10
The effect of MXene mass fraction on the thermal conductivity of CF/MXene/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation
Fig. 11
The effect of MXene mass fraction on the tensile strength and impact strength of CF/MXene/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation
Fig. 12
The effect of heat treatment on the tensile strength and impact strength of CF/MXene/PI composites. CF, carbon fiber; PI, polyimide. The error bars represent 5% standard deviation