Effect on carbon fiber surface structure and tensile strength irradiated by γ-ray

It is a new technique that high-energy radiation modification on the surface of carbon fiber (CF) which is high efficiency, save energy and environmental protection. Polyacrylonitrile (PAN) based CF was irradiated by ⁶⁰Co-γ-ray at different absorbed dose (0-1000 kGy). Atomic force microscopy (AFM) was used for characterized the surface morphology of carbon fiber. At the nanometer scale, AFM images revealed a moderate increase about the amount of grooves at lower absorbed dose (<30 kGy) and decreased at higher absorbed dose. The grooves became deepen and widen as the dose increasing. The Raman curves were fitted by Gaussian-Lorentazian function. It was shown that the structure of the CF slightly alternated by irradiated and that the more dose treatments induced the higher surface crystallinity, as detected by Raman measurements. The CF strength that after irradiated was analyzed by different gauge length single filament strength, which was combined with two-parameters Weibull theory.