To investigate the influences of process conditions on the structures and properties of as-spun fibers,the effects of polyacrylonitrile(PAN)contents on the viscosity of its spinning solution were studied via using a rotational viscometer.The results show that,with the increase of PAN content,the non-Newtonian fluid characteristic of the spinning solution is increased.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)were used to investigate the influences of coagulation bath conditions(the mass fraction of spinning solution,coagulation bath temperature,the mass fraction of coagulation bath,coagulation time)on the formation of as-spun fiber structures.When the mass fraction of spinning solution is 20%,the coagulation bath temperature is 60-65℃,the mass fraction of coagulation bath is65%,and the coagulation time is30 s,the PAN as-spun fibers with smooth surfaces and circular sections are prepared.
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