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The colored poly(m-phenylene isophthalamide)(PMIA)spinning solution was prepared by wet spinning and the die-swell of the colored PMIA spinning solution was done when it was extruded from a die in this experiment.The properties and structures of colored PMIA fibers were characterized by scanning electron microscopy(SEM).The colored PMIA spinning dopes were first commixed in a pressurizer and then spun into a coagulation bath.The effect of die swell on the colored PMIA solution was resulted from the viscoelastic properties of the colored PMIA solution in the spinning process.The results showed that the die-swell ratio of the colored PMIA solution increased linearly with increasing the pressure and die length/diameter ratio(L/D).At the same pressure and L/D,the die-swell ratio decreased with the increase of filter layers and temperature.Also,optimized spinning parameters of the dopedyed PMIA fiber were obtained.
The colored poly (m-phenylene isophthalamide) (PMIA) spinning solution was prepared by wet spinning and the die-swell of the colored PMIA spinning solution was done when it was extruded from a die in this experiment. The properties and structures of colored PMIA fibers were characterized by scanning electron microscopy (SEM). The colored PMIA spinning dopes were first commixed in a pressurizer and then spun into a coagulation bath. The effect of die swell on the colored PMIA solution was diluted from the viscoelastic properties of the colored PMIA solution in the spinning process. The results showed that the die-swell ratio of the colored PMIA solution increased linearly with increasing the pressure and die length / diameter ratio (L / D) .At the same pressure and L / D, the die- swell ratio decreased with the increase of filter layers and temperature. Also, optimized spinning parameters of the dopedyed PMIA fiber were obtained.