Raman Scattering for Tensile Testing of Polyacrylonitrile-Based and Pitch-Based Single Carbon Fibers.

The tensile properties of polyacrylonitrile (PAN)-based and pitch-based single carbon fibers were assessed using Raman scattering. Parameters and ratios related to Raman scattering and stress measurement for the G- and D-bands were analyzed. These include the peak values of Raman shifts (R_G, R_D), full width at half maximum (FWHM_G, FWHM_D), peak value slopes (|A_G|, |A_D|), peak value intercepts (B_G, B_D), the intensity ratio (I_D/I_G), the peak value ratio (R_D/R_G), the full width at half maximum ratio (FWHM_D/FWHM_G), the slope ratio (A_D/A_G), and the intercept ratio (B_D/B_G). These parameters and ratios were determined by analyzing the PAN-based and pitch-based carbon fibers and were correlated to the tensile modulus (E), interlayer spacing (d₀₀₂), lattice spacing (d₁₀), and crystalline size (L_c and L_a). In addition, a linear relationship was identified between the Raman scattering, stress measurement parameters, ratios and E, d₀₀₂, d₁₀, as well as between the Raman scattering, stress measurement parameters, ratios and L_a and L_C on the log–log scale. [ABSTRACT FROM AUTHOR]