Author/Authors :
Deng، نويسنده , , Wenjin and Lobovsky، نويسنده , , Alexander and Iacono، نويسنده , , Scott T. and Wu، نويسنده , , Tianyu and Tomar، نويسنده , , Neetu and Budy، نويسنده , , Stephen M. and Long، نويسنده , , Timothy and Hoffman، نويسنده , , Wesley P. and Smith Jr.، نويسنده , , Dennis W.، نويسنده ,
Abstract :
Acrylonitrile/1-vinylimidazole (AN/VIM) copolymers containing various mol% of VIM were synthesized by free radical solution polymerization. The copolymers were characterized by Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy, 1H NMR spectroscopy, gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). Char yields of the copolymers were 40–48% as determined by thermogravimetric analysis (TGA) while gel fractions were found to be 90–99% depending upon the composition, temperature and time. The complex viscosity of the precursor copolymers was measured as a function of composition and temperature. 82/18 mol% of AN/VIM copolymer based carbon fiber precursor was successfully processed by solvent-free melt spinning at 192 °C and the melt-spun fiber was characterized by DSC, ATR-IR, and X-ray Diffraction (XRD).
