抄録
The experimental study on melt spinning has been carried out for a petroleum mesophase pitch. The thermal properties were examined by thermogravity analysis and dilatometric measurements. Glass transition temperature of the mesophase pitch is 130°C which is higher than that of isotropic petroleum pitches. A die swell can not clearly recognized in the mesophase pitch melt spinning. The strain rate of the running filaments is extremely high by comparison with polymer melt spinning; the value is attained to 150sec-1 at the maximum point along the spinline. The region of elongational deformation is very narrow and close to the spinneret. The elongational viscosity of the deformation region is the range from 3×103 poise to l×104 poise, which is similar to that of the conventional polymer melt spinning. The temperature at solidified point of the running filaments is 270°C, The mesophase pitch orients even by shear flow in a capillary die and the orientation of methophase pitch further increases by the elongational flow of running filaments along the spinline.
