Evolution of Fiber Morphologies during Poly (acrylonitrile) Electrospinning

In this study, we used a facile approach to examine the evolution of fiber morphologies during electrospinning, via solidifying the newly electrospun polyacrylonitrile (PAN) nanofibers in an ethanol bath at different electrospinning distances ( 2 cm to 10 cm). It has been observed that a massive jet-thinning took place at the initial stage of whipping instability, followed by uneven fiber-stretching. The fiber-stretching at the later whipping stage was mainly concentrated on beaded fiber sections, which improved the uniformity of the resultant fibers.