wet-spinning assembly of polyacrilonitrile/non-solvent reinforced fibers with improved structural order and mechanical properties

In this work, polyacrylonitrile (pan) fibers with adding non-solvent (h2o) have been prepared using wet spinning method# tap-water has been applied as a coagulation bath and then it has diffused into pan spinning solution which has led to a rapid pan fiber solidification# all of synthesized fibers have been studied via field emission scanning electron microscope (fe-sem) images, differential scanning calorimetry (dsc) analysis and x-ray diffraction (xrd) pattern# the cross-sectional morphologies of synthesized fibers show that presence of non-solvent in spinning solution reduces the number of micrometer channels and depth of the channels while increases number of finger channels# also, xrd and dsc results presents that the pan/h2o fiber has a higher crystallinity and, in this sample, the polymer chains become less degraded as heat is# all of these findings indicate an enhancement in the structural order of pan/h2o fiber, which can ultimately improve the mechanical properties of them#