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Abstract
A new method for studying structural uniformity of polyacrylonitrile (PAN) nascent fibers is presented. The difference between external and internal structures of nascent fibers could be accessed by measuring radial direction solubility (r0 − rn). Scopephoto and microscopy were employed as tools to observe the cross section and surface of nascent fibers at any DMSO/H2O dissolution time. The dissolution velocity ratio (exterior/interior) of nascent fibers was considered as a convenient means to study structural uniformity. The results showed that homogeneous nascent fibers were achieved at higher temperature when the coagulation bath concentration was set at 70 wt.%.
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