Surface Modification of Polyimide Fibers and The Bending Property of Polyimide Fiber/Polyimide Composite

Alkali/DMAc was used to modify the surface of high-performance polyimide (PI) fibers. The surface chemical composition, morphology, roughness, and thermal properties of the modified PI fabric were characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), and thermogravimetric analysis (TGA). These results suggest that the surface roughness was improved. The modified PI retained its original chemical structure and exhibited good thermal stability. Meanwhile, the wettability of the PI fabric was increased, which was conducive to forming a good interface between the fiber and matrix. Compared with the pristine state, the bending property of the modified PI composite was obviously increased.