Effect of fibre microstructure upon the modulus of PAN- and pitch-based carbon fibres

Structure–property relationship of recycled carbon fibres revealed by pyrolysis recycling process

“…Furthermore, it can be noticed that the positions of both G band and D band were shifted towards higher wave-number and the D bands became broader after recycling, which can also be evidence of a reduction in La [36]. The penetration depth of the laser beam of Raman into the carbon fibre is only of the order of 60 nm [39][40][41][42], and so the Raman spectra only contains information from the fibre surface regions. It can therefore be inferred that the reduction in La is due to the existence of surface defects indicated in the surface energy measurement, because the surface defects can disrupt the continuity of crystallites of surface layers.…”

The Effect of Stress Transfer Within Double‐Walled Carbon Nanotubes Upon Their Ability to Reinforce Composites

“…[8] Raman spectroscopy can be used to follow the level of stress transfer between a reinforcing phase and the matrix in a composite. This was demonstrated originally for polymer fibers, [12] carbon fibers, [13] and more recently for carbon nanotubes. [4,14] These high-modulus reinforcements have welldefined Raman spectra, and the rate of shift of the Raman bands per unit strain scales with the Young's modulus of the reinforcement.…”

Latest Advancements In Carbon Based Fiber, A Review

“…al. [63] affirmed that the presence of sheath-centre formation in (PAN) carbon filaments utilizing spectroscopy of Raman. Two districts in antecedent strands were in charge of arrangement of sheath-centre formation in resulting CF (carbon filaments).…”