Structural changes of polyacrylonitrile precursor fiber induced by y-ray irradiation

摘要

The structural changes of polyacrylonitrile precursor fibers under y-ray irradiation were studied. The Fourier transform infrared spectroscopy (FTIR) results indicated that chemical reactions occurred in the irradiated fibers. The thermal and thermal mechanical behaviors of the fibers, which were characterized by differential scanningcalorimetry (DSC), thermal gravimetry (TG) and thermal mechanical analysis (TMA), changed under irradiation, since ladder structure had formed in the fibers under irradiation prior to the heating process. The crystallinity and crystallite size were found to decrease with the increase of irradiation time, as the chemical reactions induced by y-ray irradiation affected the crystal structure of the fibers, y-ray irradiation may be useful in accelerating the thermal stabilization of PAN precursor fibers.