Abstract
The influence of microwave heating up to 1000 °C on the structure and mechanical properties of pre-oxidized fibers (POFs) was investigated. Heating curves, changes in length, and shrinkage rates (SRs) were studied. The microstructures were analysed by Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and Raman spectroscopy. The mechanical properties were investigated by analysing the fineness, breaking strength, elongation at break, and initial modulus. Results show that as the temperature increased, the trend of the heating curve, change in length, and SR (up to 23%) tended to be flat, and the degree of carbonization increased. Microwave could effectively reduce the surface defects of the carbonized fiber. RI (ID/IG) at 1000 °C was 1.23. Fineness was reduced from 0.66 to 0.32. Breaking strength decreased from 7.94 dtex to 4.32 dtex. Elongation at break decreased from 2.17% to 0.99%. Initial modulus increased from 304.91 dtex to 654.72 dtex. These characteristics endowed the fibers with enhanced mechanical property.
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