Analysis of carbon fiber structure based on dynamic laser Raman spectroscopy

Abstract

AbstractThe in‐plane modulus and inter layer shear modulus are the intrinsic properties determining the carbon fiber's characterization, but could not be gotten for a single sample. With the addition of dynamic Raman spectra, the parameters are obtained from five carbon fibers individually, which interpret perfectly that the Young's modulus and conductivities are not consistent according to the normal views. The mesophase pitch‐based graphitized carbon fiber has thermal conductivity of 635 Wm−1 K−1, much higher than 78 Wm−1 K−1 of the polyacrylonitrile graphitized carbon fiber, even the modulus of the latter is higher than the former. The Young's modulus of polyacrylonitrile carbon fiber and rayon‐based graphitized carbon fiber are 260 and 140 GPa; however, their thermal conductivities are lower than 1.0 Wm−1 K−1. With these two intrinsic properties, the structure of a carbon fiber can be understood clearly, so that the properties can be enhanced accordingly.