In terms of the correlation between the structure and performance of PAN-based carbon fibers, Chinese researchers found that for PAN-based carbon fibers with a modulus greater than 350GPa, the increase in the degree of graphitization has little to do with the increase in modulus. The regular arrangement of graphite sheets and the growth of graphite crystal size and the increase of graphite crystal orientation;
For the strength of PAN-based carbon fibers, the shortcomings of entanglement between graphite crystals and graphite sheets can effectively disperse the stress of carbon fibers during the drawing process, thereby improving the strength of carbon fibers.
In addition, any defect structure in the carbon fiber, including micropores, sheath-core structure, etc., will lead to a decrease in carbon fiber performance. The ideal PAN-based carbon fiber structure should be uniform to minimize defects such as sheath-core structure.