Abstract
An experimental study for petroleum liquid crystalline pitch materials has been carried out to clarify the relationship between rheological properties and melt spinning process. The softening temperature, specific heat, viscosity, and dynamic moduli were measured. The flow activation energy was obtained to be 55 kcal/mol from the viscoelastic measurements. The attenuation process in melt spinning occurred only close to the spinneret. The stress growth of the running filaments was calculated by using the Bogue-White constitutive model. The experimental data were explained well with a single relaxation time of 0.01 sec and non-linear parameter of 0.5. Spinnability was inversely correlated to the relaxation time for the liquid crystalline pitch.
